"What screen problem?"
C. S. Wild
I have owned a Mk iv for about 6 months, and so has my partner. Together we typically shoot at least 4000 photos a week, and our Mk iv's have been rock solid. No issues at all. I'm really not sure what happened to the previous reviewer's camera, and can not find any mention of a screen problem with the Mk iv on Google, other than the amazon review.
I prviously owned a Mk iii (one without the focusing issues) and am definitely pleased that I upgraded, the extra resolution allows me to crop tighter, the focusing is definitely improved (its pretty much spot on with the default settings, whereas my mk iii needed lots of tweaking to get it just right), and it's still bulletproof.
Well worth the investment