>>4106194Based essayfag here, for me it's probably the K-3 III or the K-1 II. But I have a soft spot for the K-70 and its articulated screen. The replacement doesn't get me excited, it's like $400 more for some very marginal improvements that don't make a difference at all. The only cameras with a viewfinder as nice as the K-3 III are the Olympus E-5 and E-3.
645Z tickles my gear lust too, that clack is amazing and it performs well.