I recently bought the A77 (not the M2). I don't use it much because I'm thinking of saving it for important work. For my everyday hobby, I still use the A65.
I do mainly HDR. I like doing HDR in NYC because moving objects like people confuse the HDR software and so are effectively erased. The resulting images are of NYC devoid (well, mostly) of crowds.
With the A65, I use the knob-wheel to change shutter speeds between shots. Even when mounted on a tripod, my touching the camera (by turning the knob wheel) introduces mis-alignments. They are mostly minuscule and are easily fixed by nudging the images up/down or left/right during the alignment step. But occasionally, misalignment is harder to fix because it occurs as a pitch-roll-yaw movement. Although the resulting HDR image's mis-alignments aren't noticeable by most people, I know they're there because I've seen better.
Yesterday, I took my A77 out for a spin. My aha moment came when I found out I can set it to bracket 5 shots spaced at 0.7 ev apart. I only needed to press the button on my shutter release cable once until all 5 shots were taken. Because I didn't touch the camera, all 5 shots are perfectly aligned. Also, my brackets took a lot faster because I didn't have to turn the knob wheel for each shot.
Granted, the total spread is only +/-1.30 ev (as opposed to what many recommend as +/-2.0 ev). But the A77 is also capable of bracketing 3 shots with 2.0 ev and 3.0 ev spacings. The 5-shot bracket and 2.0 ev and 3.0 ev spacings are available only on the A77, not the A65.
I still plan on using the A65 for my everyday hobby and save the A77 from wear-and-tear-and-bumps by only using it for more important work. But it's going to be a lot harder now that I've taken better and faster brackets with the A77 which seems to have been designed with the HDR shooter specifically in mind.
Attached photo is of Times Square early in the day. A77 bracket of 5 shots at 0.7 ev used. Lens is Sigma 10-20mm. Software used are Dynamic Photo HDR (DPHDR), Topaz, and Photoshop CC.