I have been using the M6 TTL for a couple of weeks now, and I like it a lot, although it has a few "quirks". I also have an MP, and there are some differences.
I like the SS dial. I thought I'd hate it, but I really like it. Very ergonomic & intuitive. M6 wins easily.
The film advance. It seems like a longer throw at first, and it may just be the jointed lever, but it's wind on seems a little 'tighter' , though just as smooth as the MP. Of course the MP is a little more broken in. Close call, but the MP's advance lever wins out.
The noise level. It's certainly not much, but the MP seems quieter--if only marginally. MP wins slightly here.
The finder. Hands down the MP wins. The M6 finder flares out often. It is just as bright, maybe marginally brighter than the MP, but the finder will need to be replaced with the first cla. In fact I was looking at all of my RF's to compare finders, and my personal, non standardized, highly subjective conclusion on the finders in general are: The ZI's is the best. The Hexar RF is almost as good. The MP comes in a very close 3rd and the M6TTL a distant 4th. I was surprised myself. The test was pointing the finder's patch at an incandescent lamp, and trying to focus. It was impossible with the M6 TTL. I struggled. All the others snapped into focus very relatively fast. The MP seems the most flare resistant, The ZI is the brightest, followed by the Hexar RF, and both these are fairly well flare resistant.
It is a fine camera, and the only bothersome issue to me is the flare prone finder. It will have to be replaced, but I will keep it.
