Took advantage of Etihad's BRU-Oz special but couldn't find definitive biz (Pearl) seating info for those staggered seats on EY, so here's my input.

Biz Cabin has a light, airy feel due to the absence of overhead bins in the centre. The only bins are by the windows so get in early. There's no underseat storage either, everything must go in a bin or be spirited away by the cabin crew to a cupboard. Worse, the bins are not deep enough to accommodate a regular rollaboard wheels-first.

The actual seats are great, like other's F seats, huge 88" pitch and continuous recline to flat bed with an ottoman - but less flimsy than eg BA J and better laid out. With their peculiar staggered seating, no-one ever has to climb over anyone else. Nice big IFE screens and reasonable choice. Good lighting, choice of 3 lights. Laptop power points accept European, US, Aus and every plug except the UK 3-pin used in their own country.

Flew on the A332 v1, the one with no F, but the biz cabins are similar on most of the other configs.

In this case Biz was rows 4-10: 3 centre pairs, 10 aisles, 6 windows = 22 total

For a single traveller (unless claustrophobic) the window seats are very private but not locked in. You squeeze in and out through a narrow gap between the closed ends of the aisle seats half-behind and half-in-front. The bulkhead window is rather near the curtain and 5K fronts onto a toilet. The mid-cabin windows are the nicest IMO..

...Though the rearmost window seats are shown as green-desirable by SeatGuru being even more private as no-one is overlooking you. But I sat in one and found it less desirable: narrower than the others, backing onto the galley noise and nowhere to rest my aisle-side arm due to a sort of wall above the armrest - actually the back of an FA's cupboard with a flat table-top from where things could ultimately spill onto one's head.

Window seats have more room then the others, some potential storage on the floor alongside the window - important as there's not much storage around these seats, they're only 20" wide.

For a couple 5EF, 7EF or 9EF are the only ones with 2 seats (beds) alongside. 5EF are at the bulkhead, effectively aisle seats, but 7EF and 9EF are quite private, and the seats flatten out to a sort of double bed. hmmm!

For a couple wanting to sit opposite sides of the aisle, this doesn't work as for example 8G is a metre in front of 8H. Similarly there are no aisle / window pairs. So if you can't get 5/7/9 EF you won't be together. However the ottoman would seat a companion temporarily to share a meal or play chess.


Summary:
single person - window seats, private but not locked in
couples - centre pairing only, very private unless bulkhead
aisle seats - rather exposed
back row - avoid
overhead bin space extremely limited