Off the top of my head...
CX - always good, often greeting, particularly long hauls, intra-Asian flights probably 50/50. Though have always been paid J, except for once was HKG-TPE, 2 of us, full Y fare, last two tickets the night before... phone staff rang us up a few times to unblock seats and move us to exit rows. Was overbooked of course so we were both op-upped.
BA - pretty much nothing, as you'd expect
exit rows are good of course in Y
AY - only flown in shorthaul Y, no real recognition at all - the status thing is nearly foreign over there. Actually in MOW had to convince the Aeroflot staff doing ground handling for AY that we had priority check-in and in HEL had to show the platinum desk their own website about the extra bag for OWE (this was prior to the alliance wide policy).
RJ - not sure if they noticed, but have only ever flown J both long, mid and short haul - always pretty good. Hard to get preferential treatment when there's only a few people in J anyway.
S7 - again J only. Last time I remember getting some preference over the other couple but nothing specific to acknowledge we were emeralds
LA - flown on the SYD-AKL J run several times, so not a great example.
MH & AB have only short flights in Y so nothing on them.
So CX does do a top job, depends how important you consider 'recognition'. Staff training on such things is obviously a challenge and the question is whether the effort should be coming from OW or the individual airlines.