I want a Planar/Xenotar. From what I gather the difference between the Planar/Xenotar is irrelevant. My questions: 1) Asides from the light meter, are there any functional differences between the E's (with removable hoods) and the F's? 2) How is the balance of the 2.8? I shoot a lot of available light so this is one that I'm considering; however many people prefer the balance of the 3.5. Is the balance and weight enough to deter you from these cameras? Or is it mostly the price? 3) Is there a difference between the 5- and 6- element variants?