No, I think ethics are a pretty constant thing. Whether or how much a fellow chooses to ignore them is what varies. A humane kill is what we're looking for.
A properly equipped fellow that practices at distance year round may be a more ethical hunter at 400 or 500 yards than some guy that drags old Trusty Rusty out of the closet the night before the season opens --"Dang, I thought I had more than 7 bullets left. Oh well, I don't need no sighters."-- is at 100 yards. The same deal with the "specialty" shots, head, neck, ear hole, eye.
Where the ethics comes in is regardless of what sort of shot your make or how the deer reacts or even doesn't react, you have to go to that spot and make a honest and determined effort to see if you hit the deer and to find the deer. Often, only you will know if your effort was indeed honest and determined or if an effort was even made. And that, my friends, is ethics. And it is not a situational thing.