Originally, I wanted to ask the OP - "Are you wondering if an L lens would allow you to drop it continuously?", but then I remembered about the warning I've got from the "trolling rights watch" (no offense . So, is it the first time you've dropped it?
Yes, it was the first time I dropped that particular lens, and that was from only one metre high onto a wooden floor. It was however the second time I destroyed a 50F1.4 as the first one died with exactly the same problem when a handheld scanner slipped out of my hands and hit it while it was on a camera. I have lots of other lenses (both L and non-L) and never had any issues with those, even though they are used in averse conditions (having people bump into you, backpack on bike, doorframes. tripod failure,...)
So my question was rather than "can I drop it continuously", "Do the L Lenses with internal focussing offer better protection against deformation" Because If I have to baby the 50F1.4 every time I throw it in a backpack, I might as wel save up for the 50 1.2L as i'll end up destroying more 50F1.4's in the end (Now on my third copy of the lens already)
But no offense taken for your original question, it was more about the fact that the particular lens I have is apparently very prone to issues due to the construction (so Next time, I'll replace it tiwth the L anyway)
That makes sense. However, you would throw away a lot more $ if you destroy a 50L . You've said that you love the manual focusing ring, then maybe a pure manual prime is what you need?