However, I think the Z looks unbalanced, and the S looks too much like a 5.
The O looks a little too narrow, compared to the C, which looks too wide.
The O,C,G,Q should be similar, shouldn't they?
The S does look like a 5, as Audiopimp pointed out.
There is something about the G that is throwing me off. Maybe it's the length of the arm being a hair too short.