interesting... seems to be assembly tolerance
So I was at the dealer Saturday and looked at three new F8GSs they had on the floor. One of them had the same very tight clearance (no way to get a filter wrench in there either), one somewhat tight, and one had plenty of room. Dealer Tech I talked to about this was not aware of this (which surprised me a little).
One new bike had a ding on the inside of the header right by the oil filter. So it seems to depend on how the headers are mounted from the factory. I will loosen mine and attempt to move them out of the way and if there is enough movement the oil filter wrench should fit.
Mine apparently were installed with too little clearance for the new filter to fit, and so was at least one new bike on the floor. Will report back after I try to rotate the headers out a little.
"Rumors of my assimilation are greatly exaggerated." (Capt. Picard)