I just discovered that if you hold down the play button and press the left or right arrow simultaneously, you can quickly toggle to compare successive images while zoomed in. I previously thought this was something only Nikons had – glad to see this handy review feature on the M9 and M9-P, too. Should make assessing images on the fly a lot faster. MT
Quick tip for the Leica M9: toggling images while zoomed in
March 21, 2012 by
Ming Thein | Photographer 
Wow! I just ran across this note. I’ve had the camera for more than a year and never known. So cool! Thanks for stumbling into that!
Works on the M8 as well.
Thanks for confirming that. I guess it’s one of those things I never discovered despite owning two of these and shooting them extensively for a couple of years…