Since it was a request for opinions...

My opinions on 900 yard head shots on game animals in general are:
If you did it and intended to; I'm impressed with the shot.
If you can do it 3 times in a row and intended to; I'm impressed with your shooting skill.
If you didn't intend to but hit there anyway; I'm impressed with your luck.
The fact that you even thought of attempting it does not impress me at all.

Take it for what it's worth.