I get waxed to just above the knee. My upper legs are atrocious (thunder thighs!) so they don't really see the light of day much. Was thinking about waxing my entire leg and the advice from my beautician was that if I haven't touched it before, don't - just leave it.
I used to shave to about halfway up my thigh, and try to get them to wax up that far (particularly just above behind my knee, where the hair has grown back really dark for some odd reason) or get a 3/4 wax in summer.