noimmunity
scratch my niche
There's almost always a compromise involved somewhere, unless your needs and budget exactly match what the camera offers.
I have a GXR-M and a M9, among others. The GXR-M's image quality is a not M9-like, but still does a great job. The lack of AA filter gives it very sharp images, but not in the same way that a M9 is sharp. The M9 gives me some of the richest and sharpest images out of all of my cameras. Having said that, I would definitely use a GXR-M plus some good lenses as a landscape hiking kit. It's not that the GXR isn't a great camera - it is. Due to its size, convenience and image quality I now use it as much, perhaps more than, the M9. But the M9 produces super images.
I bought the M9 because dragging a 5D Mark II everywhere was getting tiresome. The irony is that over the last couple of years I've becomes less and less tolerant of weight to the point where even a M9, a few lenses and a backup camera or two is heavy. Where I used to carry the M9 all the time, I now only carry it if I know I'm not walking a lot, or it will be in my hands and take the weight off my shoulder. Or if the situation demands the best image quality I can get, I just suck it up and take the M9.
If the M9 had not spoiled me with its image quality I could happily use the GXR as my compact solution. Image quality, plus the ability to use M-mount lenses at their intended focal lengths and with appropriate depth of field, means that the M9 will always win the ultimate battle for me. But for general purpose and non-critical shooting I am very happy with the GXR.
"Best compromise" is really the key here. When I posted this message several months ago, I was in the process of re-evaluating the criteria that for me would constitute "best compromise".
If I didn't already have an M8, but did still have the M lenses I do, I would definitely think the GXR+A12 M mount would be the best digital landscape set up for mobile uses like backpacking. I think it is better than the M8, but not better enough to warrant the cost of changing and/or the 'cost' of losing a mechanical rangefinder.
Still, in almost all cases, I would prefer to take the Bessa T or the Bessa R4A loaded with Velvia 50.
I would love to have an M9, but it does not fit the criteria of best compromise for me at this time, nor for the forseeable future.