Originally posted by TropicalMonkey Dynamic range difference is negligible to minimal as per DxO.
What is the vibration issue that you mentioned? I am eager to read more about that.
Most of the dynamic range difference is based on the ability of the K-5 series to reach down to 80 ISO, allowing for 14.1 stops vs. 13.4 on the K-3; at matching ISO starting at 100 on up there is no meaningful difference. Still, we are talking about 2/3rds of a stop, according to DxO, so fairly minor given that ISO 80 is the main reason - but real.
Others have reported very slight blur issues on the K-3, as well, so I'm not imaging it. Not at all sure if it is shutter or mirror slap related, but it is real. I'd say most pronounced at around 1/80th. Believe me, you have to pixel peep to see it, and then only in shots taken with sharper lenses and low ISO that exhibit very fine elements such as hair or animal fur. I saw a bit of it on the K-30, more on the K-3, and none AFAIK from the K-01 (no mirror, obviously).