I owned a M2 and CL at the same time, and now my rig is two M2s.
To me, the M2 gave and gives a "user satisfaction" that is hard to beat.
The lighter weight and smaller (but not much) dimensions of the CL can be nice in daily use, if you carry it a LOT in your hand. But every time you press the shutter, you might miss the sound of the M2 🙂
I found the metering readout of the CL to be actually quite nice and usable (battery can be solved via a 13 Euro or so adapter from Frans de Gruijter (Netherlands, ships quickly and works well on the CL).
You also asked about loading film etc.: prefer loading the M2, hands down. Once you pop open the CL, it feels and looks very much like a slightly larger Rollei 35 - never liked how thin and easy to bend the metal of the back door is with the CL. Keep in mind that the white plastic uptake spool of the CL is prone to break - can be fixed/glued though.
I also was not crazy about the CL's viewfinder. On the right side, where the meter readout is, there is a "bar" of the same translucency etc. as the framelines. It's "thickness" changes with parallax-correction/whether you focus near or far. That also means that just glancing through the finder, the framelines seem unbalanced/not symmetrical. Using a 50mm, it is not so bad, because of the 50 mm framelines "inside" - but with 40mm, I found it very distracting. I always had to mentally reconstruct the "true" outline of the 40mm frame.
Maybe some CL users here will think I am bonkers (I had never before read about this parallax-depending variable thickness of the bar on the right, and was quite surprised when I got my CL), but that was my experience.
The good stuff about the CL:
- it's black 🙂, if you care about that. M2s in black cost an arm and a leg
- finally for a Leica rangefinder, the hotshoe is actually laterally on axis with the lens!! 🙂 I see the CL as the perfect "host" for 28mm and wider, where you would use an external finder anyway. NO lateral parallax at all distances.
- the shutter speed dial on the front surprised me positively. It is made from metal, feels solid and is very intuitive. Also, I found I had no trouble using it alongside a M2. It is so different that you will not get confused
Final thought: at some point, any Leica rangefinder will need professional attention/care/whatever, and when that moment comes, I would gladly pay to have a M2 brought to spec, while I would not equally feel confident or willing about sinking money into the upkeep of a Leica CL.
Greetings, Ljós