Pentax Telephoto 55mm f/1.4 DA* SDM Autofocus Lens for Digital SLR

My own research on this subject indicates that yes, the general opinion is that this lens covers full frame. I wouldn't hesitate myself to count it as a potential normal prime for a FF Pentax. My only recommendation would be to make your own interpretation of the available data, at least until the K-1 is in general circulation and a lot of people with the lens have tried it out on the new body. One thing's for sure-- it's a great mild tele for a crop sensor Pentax.

I havent experienced any issues with this lens when using a K3

No, this is not even technically a full frame 35mm lens. This lens is part of Pentax's performance series of APS-C sized sensor lenses. It isn't even the same mount for the 645 series.

No