I have HHKB and RealForce 87U. Both are great boards, no doubt the RealForce V2 is great too.
But they are different - HHKB is 60%, and although there are a few MX-style HHKB lookalikes, most 60% boards have a conventional TKL-like layout, just without function keys and navigation keys.
I have a Womer 60% keyboard, and the arrow keys are mapped over WASD, activated with the Fn key on the far right of the keyboard, thus requiring the use of 2 hands to use arrow keys. The HHKB has arrow keys mapped on the right of the keyboard, same as the Fn key, so I find the HHKB layout far more useable.
HHKB is case-mounted, and all plastic, so it is very light with a corresponding light sound. RealForce is plate-mounted, and thus feels and sounds much heavier.
Like many, you may end up getting both.
Good luck!