I would say this is the most "battle"-like can war to date:
https://www.youtube.com/watch?v=2RRx52dH7Qk
Just to keep a record, it was between 4486 and 399.
It is the Final 1 match from the San Diego Regional; the situation from which arose the red card controversy, and later, Frank's blog.
I don't think I've seen to date a can battle quite like this, with simultaneous grabs, and quite a struggle. Unfortunately, I fear we may be seeing quite a bit of this at champs, or at least in elims and on Einstein. With everyone trying to get those cans, I would bet many teams are adding can grabbers, or at least making theirs faster.