I agree with Kenneth Sky that the most likely upgrade option is another from Sony, who are already making a 12.5MP CMOS sensor of the correct "1.5x" size, for the Nikon D2X.
And about KM?
Any news concerning a Maxxum 8/9D?
I didn't like some aspecs of M7D:
- lens goes to infinite everytime you power on;
- doesn't handle well in incandescent light;
- abominable CF read/write speed for such expensive cam;
- AF iluminator = flash picture.
Maybe a new firmware to fix it?
Regards!