My friend and I had a discussion about overhead bin space on 77W Business Staggered.

He claims that the overhead bin space above seats 7A (bulkhead) and 8C is extremely limited and unpreferable. Is that true?

As far as I can see, some business class pictures of some versions of ANA's 77W (3-4-3 Y Class config vs 2-4-3 Y class config) seem to show that there might have a usable overhead space over 7A.

My question: If I currently have seat 8C on 77W (version with 3-4-3 Y class), will I have issues finding space for a typical roll-a-board carry-on? Should I change to like seat 10C or 5A?

Typically, will I have issues finding overhead bin space on 77W Staggered Business Class?