very cool shot Sime,
i just did a boxing shot myself.. i'll post it in a week or so
for me, the composition leaves a tad too much head room behind the puncher, the guy blocking as a "reasonable" amount of space, and i like that the spectators entire face is in the frame, especially seeing as its so bright/well exposed.
i'd give it a very slight crop, taking some space pff the left of the image.
another possibility would be to darken the spectators a little, some of them are almost as bright as the boxers themselves, especially thse ringside.
what a cool opportunity, i love the motion blur on the glove.
well done