There is less competition in the APS-H range than either the APS-C or FF crowded world . Another "set of equivalent focal lenght" isn't necessarily a bad thing , on the contrary , if you own both an APS-C and an APS-H camera there would be more flexibility provided one knows what his intention is in the first place ( or buy a 17-300mm F6,3-9,5 zoom instead , but then the addeed image quality of a 20MP sensor would be useless ...) .
Blinking WITH BOTH EYES is a natural reflex which induces far less muscular tension than pushing the conventional shutter trigger and would become useful at , let's say , 1/25 - 1/5 s . And I don't mean replacing the shutter trigger button but the shake reduction system which is bulky and inneficient ( 1 EV
Falk Lumo: Pentax shake reduction revisited ) where it is most needed at longer focal range . It may be so that even a FF sensor would fit in a Pentax K-5 / K-7 body without the shake reduction mechanism ( I am not an engineer to calculate that but there must be somebody at Pentax or Ricoh able to do it ...) . So how about a FF 21-24MP sensor in the K-5 / K-7 body at a reasonable price , wouldn't it be lovely ?