Well, all were shaving sharp before I started. All appear to be full flat grind too .. but there the similarities end.
The Nielson is a great utility knife and I love it but it really struggled to cut the green wood at all. No idea why.
The SAK Farmer was great, very controlled cuts and a nice size for carving. It did need a touch up on the sharpener a
couple of times though.
The BB forum Urban was just fantastic which really shocked me. Maybe the blade is a little large but it sliced into the wood with virtually no effort at all. And it kept on cutting .. and cutting. In fact it was so good I did probably three quarters of the carving with it. At the end it was still shaving and needed no sharpening at all. That Elmax is good stuff !
I never thought I would say it but my new carving blade is a Spydie ... well until I get a cheap Mora
Anyone who has the BB knife should give it a go