Square chisel leaves sharper lines for sure, but I don't believe they're any deeper than what you have with semi chisel. It's the depth of imperfections, not the general appearance, that matters the most.
Usually, the way newbies seem to all start sideways seesaw down a cut, stop and start cutting mid log to do various things, and fang the saw into a cut, and the lack of mill rigidity contributes much more to finish than the chain but once they have mastered that. it's the chain that males the difference.
My experience is that while square/full chisel produces the same kerf size as semi-chisel, square/full chisel does in general leave slightly deeper random scratches in the finish, especially when using well used B&C .
A pointed cutter is much more likely to randomly dig in and rock sideways on a worn bar and penetrate sideways a little more away from the bar more than a rounded cutter.
The reason it digs in is due to variations in wood hardness, changes in chain tension, and general chain sloppiness due to B&C wear and tear.
I noticed this in particular with Aussie hardwoods because the only thing I have to process wide slabs with is a 4" wide Makita belt sander and I found that to completely removed fine chain scratches I had to sand for longer on slabs cut with square/full chisel than slabs cut with semi-chisel. When belt sanding wood that is 3-4 times harder than North American softwoods this makes a big difference.
A careful operator can generate an acceptable finish with square/full chisel but it requires regular bar maintenance and close monitoring of chain tension, and extra attention to those factors I mentioned above.
