From Pentax to Nikon?
I'm using Pentax since 1997. Now I own K20 and looking for an upgrade. The main issue was focusing moving objects indoors (I shoot dog shows) and high ISO noise. I use my camera for dog shows and traveling. I considering three options: K3, D610 (D800 is an option, but 16Mp for me is enought and extra is only to have heavier files) or Canon. I would like to ask you, those who moved from Pentax to Nikon, what advantages-disadvantages you find by moving to Nikon? What would you do if you were in my shoos?