I wonder if a 5D III would be much better than a 5D II after converted?
After looking at your picture I went online and watched a few tutorials on converting a 5D II. One site had a price around $250 to do it.
It shoots and functions like a normal camera, metering, focusing are normal but white balance is tricky.
I suspect the difference would be the same as the difference between the two cameras without IR conversion.