I do not like M5 for the follwing reasons:
It is big
It has out of date and unreliable Cds photo cells
it is not M looking camera
M6 is the better choice.
A) The Leica M5 is big:
my Leica M7 is 138 x 79,5 x 38 mm, my Leica MP is 138 x 77 x 38 mm, while my Leica M5 is 150 x 84 x 36 mm. Who's really care, in the real world?
B) The CDS cell of the M5 is out of date and unreliable:
I use, without trouble, both the silicon cell on my M7 and MP, and the CDS cell on my M5. The CDS cell of my M5 is dated, sure, but is fully realiable: the secret is a perfect knowledge of the pros and cons of the CDS cell, to use responsible manner.
C) Its is not M looking camera:
I own Leica M3. M2, M4, M5, MP and M7 last version (with the MP improved viewfinder) and I use all of them. I don't care about the aesthetics, the real quality is elsewhere.
D) The Leica M6 is a better choice (than M5):
OK, the silicon cell is more modern, more simple, more fast to use. But the viewfinder quality? The viewfinder of the Leica M6 is in the same league of the Leica M4-2, M4-P and the first version of the Leica M7. Instead, the viewfinder of the Leica M5 is in the same league of the Leica M3, M2, M4, MP and the last version of the Leica M7. In respect to the previous Leica M cameras, with the Leica M4-2 of the 1977 the viewfinder was modified, better yet simplified. Was removal a component of the viewfinder, while one of the remaining element in optical crystal, was replaced by an acrylic element, which over time may tend to become opaque. Furthermore, due to the simplification of the viewfinder, from the Leica M4-2 to the first version of the Leica M7, their viewfinders are more prone to flare. The viewfinders of the Leica M3, M2, M4, M5 and MP and the last version of the Leica M7 are flare free.
Finally, you have overlooked another famous charge against the Leica M5, the supposed weakness of her particular meter's activation system. Exactly, supposed... my M5 was released in the 1974 and his light meter has always worked perfectly, never missing a beat in his way of activation. The same things happens for all the Leica M5 I've got to try.
Therefore, Gentlemen of the Court, I will conclude my speech, arguing in accord with Mr. Geoffrey Crawley, that the Leica M5 is a truly masterpiece of engineering, whereas that was designed during the sixties. And is still perfectly usable.
Ciao.
Vincenzo