As far as I know, this is the only test of it's type I have seen in the press.
No. Seen another with 3 guys all testing 3 variants of the same bike.
One preferred 26, one preferred 29, one preferred 650b.
It's the only review (note "review", not "test", cos there's nothing testing about it in a scientific way), where one of the reviewers dared to say that 650b inherits the compromises of 26+29. Of course 99.9999999% of all 650b BS will only ever mention that you get the best of both worlds.
Except in MBR where they've already decided the outcome before even stepping on the bike, based entirely on wheel size and whether the brakes are Avid Elixir,and whether the tyres are Nobby Nic.