Although I understand the term carbon steel I don't always think its very helpfull. It misses out on the nuances of all the other elements that are in the steel.
Personally I use quite a lot of handplanes, and many differing blades in them.
I've used plain Stanley non laminated, laminated Stanley, japanese laminated Smoothcut, A2, PMV-11 and just bought a high speed steel blade but haven't had the chance to try it yet.
Out of the ones this bloke has tested...
http://www3.telus.net/BrentBeach/Sharpen/bladetest.html
Ive found his testing to broadly agree with my far less scientific usage.
Its worth noting that he manages to get them all as sharp but theres massive differences in edge retention
O1 is pretty much at the bottom of the scale, just sayin like.