So should I dump my venerable M9?
To try and help decide, I tried a quick, rough and dirty (i.e. non-scientific) shootout in a camera store. Using my own lens on each body, and then taking a quick snap as I would normally shoot and in difficult store shop lighting (against the light, mixed light - interior and exterior).
The short answer is I'll be standing by the M9.
But if you're interested in why, well the details and comparison images, unscientific and personally biased as they are, you can find on my FB page which you can visit by clicking HERE