Upgrading to K-5II - Worth it?

Thanks everyone. I am likely to go with the K-5II. Happy with K-7. I do think there is value in upgrading cameras in the digital era - my K-7 will be 4 years old in July and I am not selling it, at least not yet.

Influenced in my selection by the -

• desire to improve my photo capability, 
• familiar feeling of Pentax, 
• Pentax ergonomics
• lens legacy
• K-5's good track record
• focusing ability of the K-5II in low light
• budget constraints.

I am nevertheless interested in FF digital SLRs, in particular the Nikon D600 that I consider affordable but I am parking that for now.

I do not consider that buying the K-5II would be a forever decision.  Photographic hardware is disposable. Longer term my view will depend on what meets my requirements. That may well be APS-C sensor cameras.  Presently I do not have a need to produce prints beyond 20 x 16" and I suspect that even with cropping this new K-5 sensor might do the trick for some time.

Cheers and thanks again for your help, something that you can rely on from fellow Pentaxians.