To add a little contrast:
I find manually focusing with the E-P1 (without EVF, and with a display resolving "only" 200k dots) quite doable. If you activate the magnification loupe, the whole display will be filled with a 7x or 10x magnified view, helping you to evaluate sharpness. Granted, it takes a little longer than just focusing via a high-resolving viewfinder, but it works, and once you get used to it, quite quickly indeed. What I do is pre-focus using the normal view, and then activate the magnification only to fine-tune. I get pictures tack sharp even with my 50/1.5 Nokton.