I have some A2 iron in the shop, there I've said it and I'm so ashamed. But the truth is the truth. I've some LN mortise chisels for two reasons, the first is the square profile and the second is the Hornbeam handles. I've a set of Japanese mortise chisels with square profiles as well, I'm not sure which will end up being my go to set when a square profile is needed and the decision may end up made over sharpening.
Because of the A2 I was looking on the web for sharpening advice and ran across this video, It has nothing to do with sharpening A2 but is the best freehand instructional video I've seen. I've just a small quibble with the secondary bevel portion but that can be overlooked. The video is from Norton hosted by Joel from TFWW with a demo of how to freehand cutters. Norton video
There is so much misinformation on most sharpening threads it can be
like playing “Whack a Mole” to correct ‘em. That’s the bad news, the
good is in the end almost anything will work.