There are two kinds of business class travelers, and two kinds of seats that suit them:
1. Do as much work as possible, not expecting to rest like in a bed.
2. Get drunk and watch TV.
To each his own. A smart airline would have classes for each.
You know, not at all sure about the 2 types: rarely have I seen drunks in (long-haul) business. Most do some work before the meal and then sleep, whether day or night. I find that valium and melatonin work well for the sleep!
I do fly quite a bit, usually in business, but of the current offerings have only used Emirates, KLM (and NW) and Korean Airlines. All are OK for sitting: KAL have 2 types, Prestige Sleeper and Prestige Plus. Of the three, I think I prefer the KAL Prestige Plus - the sleeper is a bit hard.
(Great service too on KAL)