As Michael writes XTOL is sharp. The Kodak tech web site lists XTOL's improved attributes over D-76. What Kodak doesn't mention is XTOL's shelf life is longer; maybe by 50% over D-76. The original published times were 1:1 to 1:3 with different EIs. Lots of options. Although XTOL is sharp, Rodinal looks different. I just developed FP4 (EI 64) in Rodinal 1:75 for 11 min, 20c. That combo looks very nice. The negs show good shadows and brilliance without being contrasty. Proof is in the printing which has to wait a few days.