Upon shooting with it for the first time today, I simply adore my mark 4. Surprisingly the slight weight gain does make a little difference, and the 30 MP is a lot better for what I shoot. Mind you, for dropping 5G on a camera body which isn't even top of the line, you should get something pretty darn good. To be honest, it is pretty darn good, but that's all. There are no nifty new surprises or anything like that, and TBH looking at the photos on the computer it's virtually impossible to tell if they were shot on a mark 3 or 4. Those of you who also bit the bullet, what are your thoughts so far?