The above points are most likely bang on however, there are other subtle things which can affect perceived sharpness...such as film/developers. If you are shooting slow film and enlarging only to 11x14, prints can lack a little bite as the grain is so very fine. Off 5x4, a HP5 neg prints far more crisply than FP4 does at 10x8-11x16...by far to my eyes. I say this as I do not know which other formats you have used and what size you print them. I was surprised by how much this made a difference when I first moved up in formats.
When I first tried Fuji Acros quicloads/Tmax100 in 5x4 I was amazed at the low bite on small prints (even dev'd in pyro). They looked far less snappy than prints off 6x7! Only when enlarged to 16x12 plus or so did the Acros start to look sharp to my eyes!
Prob barking up wrong tree, but thought I would mention it. Fine grain film plus fine grain dev on small prints from a big neg = mushy.