Ants1 Once you board the aircraft a few high status passengers are greeted personally by the CSM otherwise everyone is treated equally, to a very high standard, no matter which ticket class you have. Wifi on certain routes may still be chargeable but otherwise I have never had to pay for anything, or tip, onboard in seven years flying with QR. Note that Pyjamas are not available on all flights. See the Wiki on
http://www.flyertalk.com/forum/qatar...l#post27191309 for further details. With regard to meals and alcohol then the only limit is demand and the quantity onboard.
The same is true of Al Mourjan. Tipping a lounge waiter a couple of dollars is to be an exception rather than a rule. It will be appreciated but it appears to be frowned upon by management.
If there are differences in service on different aircraft types it will be due to the differences in cabin layout but they will be barely noticeable.