I cannot overemphasize how useful is the Peaking function on the NEX cameras. Today I put long lenses on the NEX 5N, a 180mm f2.8 Nikon, and a 100mm f2 Zeiss. There is no way I could use these lenses following moving subjects and get consistently accurate focus just by looking at the screen. My eyes are not that good, especially with tri-focal glasses. But the peaking function gave me nearly flawless focus on the chickens running free range around my yard. Here are two examples, one with each lens at ISO 100 and wide open, or maybe one stop down, apertures. If the weather permits I will try the same exercise tomorrow with the GXRs version of peaking.