IMO, the Mkii is the way to go. I have the 35mm and I was talked out of spending the extra money to upgrade to the Mk3. There are a couple extra bells and whistles but clarification and magnification are identical. I run a patrol 250 for scanning which I believe is similar to the reap IR. The Mkii turret adjustments are much more user friendly, especially when you have yotes coming in and get a little anxious. The turret adjustments are also easier to manipulate with gloves on. Gloves can make the joystick knob on the patrol a bit cumbersome. The question I am asking myself is, would the 60mm lens work better for the wide open spaces I hunt??? I do love the 35!! Hope this helps.