Got rid of both M8's and now have the D3 and the MP. The MP is the Holy Grail of M's. I can honestly say that I do not mis shooting the M8 especially since the MP is so perfect.
On the other hand, my digital world has turned to the D3. It is outfitted with zeiss 35, 50 macro and the 85. Along with the 24-70 and a 200 f2. The 200 f2 afs blows away the 180 f2 Leica i use to have on my R9. It is truly a work of art.The Zeiss 50 macro is probably the best 50 you can get for an SLR. it is unreal. A tad bit slow at f2 but a 10 on contrast, bokeh and sharpness.
No regrets at all.