[distudio]

Interesting I have a USB3 reader also however I find that cards read and write at differing speeds dependent upon reader/card combo. I will test my cards in camera using the USB3 interface as it's likely more representative of read/write rates in camera.

[Ray Pulley]

For me, it's the placement of the AF button. I'm too old to go back-n-forth so, the '5 has to go.

Ok, you only asked for the first, but here are the first 3:

1. Fast focus lock
2. Louder shutter than the wonderfully low K5 shutter noise
3. Can't find stuff on the new button/menu system

My 5 is gone as well, but at some point a K5II might take its place as the DR and noise performance of the 16mp sensor is hard to let go....

Ray

[Bigdomino]

It was the build quality and the way my hand feels on the grip. Much better than a canon.

Steve