Vitali. Remember when Lewis was holding on for life and punching him in the body? I think Vitali was laughing the entire time.
Arturo Gatti. Micky Ward was a huge body puncher and Gatti withstood 30 rounds of the best Ward could throw at him.
Norton was a brutal body puncher. When he dug his body shots in, it was obvious the receiver was feeling them.
Don't want to lump this name in with the likes of Ali and LaMotta but Khan took a shitload of bodyshots against a roided up Peterson. Don't shoot me.
Jake Lamotta without a doubt. I'm not 100% but I think he was smiling after Sugar Ray Robinson was stopped punching him mercilessly. This guy took bombs from a prime Robinson and never went down AFTER weight draining himself. What a beast.