Luffy would ANNIHILATE Logan, BFR on or off.
Luffy is much faster and much stronger.
Even if he fails to knock Wolverine out, which I doubt, pick any random large object, Luffy could easily put it on top of Wolverine, pinning him to the ground.
http://www.onemanga.com/One_Piece/82/10/
http://www.onemanga.com/One_Piece/82/11/
http://www.onemanga.com/One_Piece/82/12/
http://www.onemanga.com/One_Piece/82/13/
http://www.onemanga.com/One_Piece/82/14/
http://www.onemanga.com/One_Piece/82/15/
http://www.onemanga.com/One_Piece/82/16/
http://www.onemanga.com/One_Piece/82/17/
Grabbed a gigantic "seacow," spun it around, knocking out all the Fishmen, and threw it into the distance.
People were asking for some of Luffy's strength feats, here is an early one.