Honestly, with the wording you've used, the way it's interpreted for me is that you're assuming poor technique before thinking about the limitations of the lens. Instead of opening up with the question, you start with a statement like "This may have more to do with the way you shoot and focus.." And then you said "I rarely have hunting issues with any of my lenses.., especially with the 24L II or 50L.".
That's like someone saying my Toyota Corolla can't reach speeds of xxx, and then you come in and say well it must be your bad driving because my Ferrari can do that fine.
Also note the OP stated that the focus hunting is only a problem with the 50 1.8, his 24-70 snaps on focus almost instantly, so clearly, not a problem of poor technique.
Alright. My bad. It was never my intention to mean anything negative, especially to killswitch. Apology to you if you thought I meant differently. Should have worded my thought better. Guess I'll shut up and get back to focusing on my own work...
It's all good. I tried both 50 1.8 and the 24-70L on the same subject, same lighting conditions, focal length for 24-70 was 50mm, made sure the minimum focus distance was met for both the lens, shot in manual mode, used center focus point to lock and in slightly tricky situation (where contrast is a bit low, dim light). The 24-70L fared better in locking on to the subject (no surprise) than the 50 mil.