avotius: ah, that's a pity! I absolutely love your colour work with the planar 50, they blow me away every time I see it! You've got an amazing eye.
I've got a strong bias for colour over B&W, but even so, looking at your examples I can certainly see what you mean - the b&w shots don't have the same pleasing characteristics as your colour ones, or your wonderful b&w shots on the 35mm f2.5 pancake II. I assume you're using the same developing and scanning techniques.
on the other hand, the planar does appear to be capable of producing those pleasing characteristics - I love this shot mfogiel put up:
http://www.flickr.com/photos/59177039@N00/2214578213/sizes/l/
hmm. tricky! good luck, whichever way you decide to go.