I've been using BitBucket for years and the lack of syntax highlighting for diffs has never even occurred to me.
Why would you want to use such a limited diff tool at all? Personally, I use the best diff tool that I can find and so far that's BeyondCompare from Scooter Software.
I'm sure guys who have paid for the enterprise version of BitBucket would rather not have to pay $60 for every developer for BeyondCompare on top of what they pay for BitBucket
we need to make the web ones get the same experience level then. It's great to have it all there. Were you leave your inline notes, there's a live communication part, all feedback from automated code checkers etc.