Went back there again, and looked at few sets. The one I watched yesterday was PZ82. I could not notice any more motion issues, but since it was dark corner again, I could very well see how LE40A656's blacks glow in the dark, even at 90 degrees. I guess that's on top of my list for ******* me off. By the way, it was 1080p source playing.
Unfortunately, LE46A856 was in the very bright area of the room, along with PZ800 and Kuro, so naturally was excelling in contrast. PZ800 was reflecting bright light with phosphor so it looked quite washed out. Kuro looked quite good even in bright light, as it does not seem to reflect near as much as Panasonic panels.
Kuro is out of the question for one simple thing - 50" cannot fit in the location and budget.
Right now it's a deathmatch between LE40A756 (40W4500), 42PZ8 and 42PZ81. I thought that two years later decision between plasma and LCD would be easier, but it's same old dilemma as it was when I was buying PX60

As a tie breaker, I usually use the price. PZ8 is on sale everywhere for 874 eur, so that's probably going to be it