The MK2 now has a remarkable 79 autofocus points has nothing to envy to competition and improved iso uphill.
The MKI qualities are preserved namely a super fast burst -Think to buy a memory card that holds the route-, ergonomics menus, and superb images and stitched if you pay the fabulous Sony 16-50ssm.
Only downside, the loss of the GPS module I had finally adopted and that the flash shoe was changed, morality must buy an adapter to continue using your equipment. To comfort you, you have the wifi to more easily transfer images to a PC or facebook.