I've purchased the M9 to use as a landscape camera.
It replaced a d3x / 14-24 combo.
After a few months I'm extremely happy with the switch.
For landscape type photography there are two issues that I wish were different.
Long exposures. The camera cannot do an exposure longer than 250 sec, and then after that there is a mandatory 250 sec dark frame subtraction. This rules out using it for star trails and other longer exposures. Seems this is related to the CCD sensor and not something that could be changed easily.
Bracketing for HDR panos. For a single shot HDR the bracketing controls are great. # of exposures, spacing, etc.
However, the bracketing only works when the camera is in "A" mode. For pano's one needs to set the shutter speed manually - but if this is done then none of the great bracketing controls are available.
One can still change the exposures for an hdr pano manually, but this means touching the camera to turn a dial in between each shot, taking time (in which the scene can change) and potentially introducing motion.
Hopefully this will be fixed in a future firmware upgrade as it really is an unnecessary limitation, imposed by firmware programming and not an limitation of the camera.
Other than that I'm pretty much sold. Prints look great, my whole kit (less a small tripod) fits in a small fanny pack and using an RF again is really fun.
One from Antelope a few weeks ago with the M9 and wate.