Krell fpb300/evo420e vs pass x350.5 any opinions?


Hi anyone to share his thoughts about these ?
I have a ps audio PWD mk2 liked to krell fpb300 and a wilson audio sasha on the end.I like the sound very much , but I am considering to change my amp with newer one .My list : krell evo402e , pass x350.5 ,pass x600.5 and maybe xa100.5?
I will appreciate any thoughts from people with exp with fpb300 and any of the above
cheers!
128x128hifi76
I get the pass x350.5 from a dealer to evaluate - the unit was brand new and the first 4 days the krell (fpb 300) litterally blow it away,after that ( I still cannot understand how ) but for one day more the pass was obviosely betterered it- low end, midrange, highs - everything - more spatial info less or no fatigue at moderate levels ( the limit of the wilson) ,so I am continuing to burn it in - I will post another comment shortly
cheers
the dealer do not have the xa.100.5 in stock... too bad cause I wanted to compare it with x350.5 very badly..