I see what you're saying Jocau, and different photographers have different needs from their camera. For me the 6D does everything I want it to and a bit more. I honestly think the images from my 6D look better not just from the shallower DOF, but because of how it shows lenses "weaknesses" (soft corners, vignettin), I feel shots from my 6D (especially when using vintage primes) just have a pop that I can't acheive with my M, I also spend much less time processing the RAW files from the 6D.
That said, my M is still a fantastic camera and produces truly great pictures, it definitely still has a place with me, I just wouldn't want to be limited by shooting exclusively on crop again.
Try putting a Zeiss lens on the EOS M using the adapter for EF lenses. The micro-contrast of Zeiss lenses will make your images "pop" more.
Oh and a female friend of mine just texted me a few times which camera she had to buy (she also gave me a budget). For her, a CSC was the best option, so I recommended her the EOS M or any other CSC (like e.g. a NEX). She was eventually going for a NEX or the EOS M and half an hour later she texted me back to say she ordered the EOS M. The guy at the store told her the EOS M was a better choice than the NEX.
Of course they will finally announce the 70D just a few days after I buy a used 50D. Haven't even had a chance to use it yet as I don't have any CF cards.
Well, if you had followed the rumors, you would have known it was coming.