Based on:
Boarding this aircraft whenever possible (DOH, LAX T-2, etc.) is L1 for Business and separate air bridge to L2 for Economy - it's nice and quiet, no Economy pax trudging through and bumping aisle passengers with back packs, etc. Flight Attendants will welcome and seat you. (Business and some oneworld elites receive Priority Access boarding; the remainder of passengers are boarded in groups 1, 2 or 3. Passengers are assigned seating areas for prople with handicaps, Priority boarding and the three numbered groups in DOH.)

Side overhead bins can take a nominal 22" rollaboard lengthways; centre bins are shallower and better for laptops, smaller bags, etc. The cabin feels spacious and is provided with what seems to be the Boeing Sky lighting scheme.

Caveats: It's common to have families with children aboard, and some of these will be allowed to be loud. On a recent flight a toddler was equipped with full sets of ankle bells, which said toddler really loved - taking every opportunity to shake and stomp her feet. Some adults will speak full voice through the night. I find it easier to bring my own silicone ear plugs and fitted sleep mask. FAs and others walking by can cause floor vibration you can feel.

Occasional passengers may attempt to use your centre seat pair to get between aisles. This is poor etiquette, and I've seen passengers raise their footrest to impede them - and saw one female passenger castigate an intruder.

The seats used in Business Class are the fully reclining B/E Aerospace Parallel Diamond seats. These in a 2 X 2 X 2 configuration make the 777 cabin feel more spacious (AA "NGBC" is 2 X 3 X 2 for comparison - I'll be glad when these are gone). Seat pitch is 78" / 198 cm and seat width is 22" / 56 cm. I'm 193 cm / 6'4" and found the seat comfortable and just long enough.

For couples, the side pairs are nice; for solo flyers the centre seats offer more privacy, as nobody will be climbing over your supine form to access the aisle.

The seat back of the shell in front of you holds a large touch screen (a long reach when you're seated but with a wired remote at your seat), a large semi-open space that often ends up with bedding, and two large slots for passenger shoes. My size 46 / 12.5" shoes fit easily.

Each seat has an inconveniently placed 220 VAC with universal plug at the front base of the shared center arm rest assembly; these are covered by a sliding cover and inconspicuous. Below the far armrest and near the leading edge are medium sized stowage slots - good places for your beverage and food menus.

This assembly also holds the spacious centre-folding angled storage tables, which also offer forward and aft movement for more comfortable dining spacing. There are also two wells with sliding covers,operated by a small push button, that hold a good sized bottle of water provided by Qatar, and some additional storage space (your spectacles?). The push button for your well is on your side and slides into your seat area.

Shallow slots with hinged covers hold the corded remote IFE screen controller for the "Oryx 1" AVOD system and includes screen power on / off button, your overhead lamp switch button and flight attendant call button, as well as a covered USB (apparently 1.1 amp) power plug that suffices for slow mobile phone charger. Here is also a small sliding privacy divider. An open pocket by your hip is where you will find your headset (two prong connector if you wish to use yours), over the ear insulated affairs without active noise reduction. A gooseneck arm personal LCD lamp is there, and a power button offers two levels of light.

There is no WiFi on these aircraft.

Magazines are inconveniently placed in a rack behind and above your shoulder. Iirc, there are variable ceiling vents - iirc.

The seats are provided with fitted mattress pads the FAs are happy to set up for you, thin duvets and pillows. Pyjamas, slippers and Luis Vuitton amenity kits are handed out. These latter contain a small drawstring bag , the usual low end airline socks, ear plugs in tiny plastic clamshell case and eye sleep mask, chapstick, small bottle of Giorgio Armani eau de toilette, 75 ml (!) tube of Aqua Gio (Armani) after shave balm.

You can don your pyjamas in the nicely kept up lavs (kept clean throughout the flight except for the generally full waste bins) and FAs will hang your clothing in hanging lockers, a very nice service.

In the 777-200LR 42 seat J configuration, the forward cabin has a private feeling but rows 1 and 4 are a bit close to galley and lavs if you prefer quiet. The forward galleys are provided with thick curtains the FAs try to keep closed, but FA and passenger traffic assures these open and close all the time. The two lavs for 24 passengers are forward and on the port (left) side.

The second cabin is smaller, and row 5 has the same problems as row 1. Row 7 is directly in front of Economy bulkhead rows where baby bassinets are likely to be found and subject to noise from crying. The two lavs for the 18 passengers are forward, one port and one starboard.

Service is fairly attentive, with some personal variations. Expect the Cabin Service Director to introduce herself, pre-departure beverages including the (non-vintage, but decent) Champagnes in crystal and creative non-alcoholic drinks. Meals will be offered on demand - literally you can give the desired time or tell an FA when you're ready to eat - and be eating 10-15 minutes later (see the menu thread for more). Meal service is not trayed - you will have linen and silverware, and your food and beverages will be brought to your seat in course order.

There are duty free sales on board, and of course at HIA / DOH. Some quick comparisons with USA Amazon prices for electronics revealed prices about 40% over Amazon.

Arriving at Doha - Hamad International Airport, we parked on the Tarmac and busses were used to transport us to the terminal. Business passengers were unloaded with air stairs first, a dedicated bus was used for the J pax and we departed (and arrived at the terminal) prior to Economy passengers - a nice way to handle bus shuttles.

We had to process security before moving into the airside departures area (with lounges, airport hotel, etc.) on arrival from LAX; you need your ongoing boarding pass or e-ticket to do so. There are transit desks where you can get boarding passes. But many arriving passengers are not required to do this and arrive airside if they are arriving from "secure airports" - there is no published list of these, and occasionally a listed airport will still require screening.

(To go landside you need to go to a transit desk presumably, but residents of Gulf states and 23 countries can get visas on arrival. Alcohol importation is prohibited, and will be confiscated at Customs. Those smuggling alcohol into Qatar can get up to 40 lashes according to Katara law.)

Departing DOH for the USA there was security screening at the gate, and it took some time as most were unprepared and large electronics and liquids / gels had to be out and placed on trays, and a number of passengers were required to remove shoes. Even all plastic or fabric belts had to come off.

Note: the seat shown here is used in the 777-200LR and 777-300ER; mattress pads CN be seen sticking out slightly from seat front stowage bins. (c/o JohnnyJet.com)