question to leica m4 users

After years of pondering I am going to buy a Leica. I'd welcome of views from any users of M4, M4-2 or M4 P cameras on the relative merits in use of the different M4 models. From a lens point of view I will be using 35mm and 50mm glass. I have settled on the M4 rather than an M6 in that I don't...