M9 has better colours? since when? If you thought your Nikon colours were aneamic you had either the camera set up wrong (jpegs) ot your conversion process from RAW is not up to it.
The M9 is SLOW compaired to the D700, yes it is a COMPLETELY different way of doing things. Not better or worse just different.
Statements like 'the pictures turn out better' are simply false.
Some of my M9 shots were better, most of my D700 shots were better.
The original poster asked about Image quality.
A closer match price wise and pixel wise would be a D3X versus M9 match and I can say that between D700 and M9 the differences are small.
Between D3X and M9, for pro use in and out of studio the M9 is lacking. That's why there is an S2.
All these things really don't affect my way of taking pics as I get what I want from the Nikon but rather than trying to contribute to internet folklore find it much more informative to stick to facts.
Much better colours, IMHO
Bear in mind I only ever shoot raw
The nikon colours always need boosting and its very difficult to get good skin tones. this is not a new thing, its been mentioned many times by many people.
I would rate the Canon 5Dii better then the D700 for colours and the M9 better still.
Slow is all relative. My shooting style doesn't require machine gun shooting, so I notice no difference in speed shot to shot. Although the response of the D700 feels much faster obviously.
I have found at Base ISO, at pixel level the M9 has better detail then the D700 (in fact the M8 did as well). this is even more of an achievement at 18mp. This is probably due to the lack of AA filter, weak IR filter and a sensor designed for studio shooting.
The M9 is a completely different way of shooting from a DSLR. Its slower and more considered, but I get far more keepers and nothing OOF. Its also extremely light. Quite frankly you loose the inclination to pick up a D700, but my M9 goes everywhere with me.
Anyone who buys the M9 and expects something magical, or something more functional then their expensive D700 is on a hidding to nothing. The M9 is all about timeless quality and composition. its certainly not for everyone and I would not use the "best camera" monkier for any camera at this level.
Lastly you also have to take into account the amazing Leica lenses.
Look, I'm glad you like your D700, its a great camera. I have had two. But after a few months with the M9 I didn't need them anymore. of course if I was a sports or long range wildlife shooter I would have kept them.
All the best