Originally posted by Vagydarnuor I do know how manual focusing settings work and needs to be setuped, although It would take me some time to set it up.. If I buy a camera I would probably keep it for 6-10 years.. So if by a chance I'll become an advanced nature photographer, is it possible ks2 would be to low for me? And k3 is like an open space to grow?
There is little practical difference but there is a slight advantage in image quality on the K3.
KS2 has 12 bit raw, K3 has 14 bit raw
KS2 has one SD card slot; K3 has two.
KS2 has 20mp, K3 has 24.
KS2 does not have Pixel shift; K3ii does, K3 does not.
KS2 does not have a battery grip; K3/K3ii does.
KS2 has wifi for immediate viewing sharing of photos via phone or tablet; K3/K3ii does not have this.
KS2 has a tilting articulating screen, K3/K3ii does not.
KS2 has an on board flash - the K3 does also, the K3ii does not.
KS2 can't control a PTTL wireless off camera flash without adding a Pentax Flash like the 360 or 540 to the hotshoe. The K3ii is similar. The K3 can use the onboard flash to control other PTTL flashes.
It is unlikely that any of the features of the K3 series will make or break photos you take. However there are some tradeoffs that make one a better fit than the other for some purposes. If you shoot weddings you might want the K3 series for the dual SD card slot alone - since you get the chance to write to both simultaneously and if an SD card were to go bad you would not lose your shots of this once in a lifetime event.
If you needed to share photos immediately for publicity or other reasons the KS2 (or K1) wireless features might be best.
If you need to do macro work on the ground then the titling screen may be worth more than any other feature since it allows you to stand above and look down and compose the shots.
If you need to make super high resolution landscape photos with no movement of the subject (low/no wind, no moving people etc) then Pixel Shift (K3ii) may be a required feature.
Loads of details behind these decisions...