I've not used the 1:25 dilution -- I have used PanF with Rodinal (actually a homebrew that is the same thing fo all intents and purposes). My EI in this soup is porbably something like 25 with 10 minutes.(posted 9394 days ago)People either love or hate Rodinal. If you are used to ID-11, you'll find the Rodinal negs crisper, grainer, and sharper.
If sharpness is your primary concern, may I suggest Agfa APX 25? Try this in Rodinal diluted 1:100 for 14 minutes at EI 25. APX 25 is remarkably sharp -- it is also rather unforgiving.
For unreal sharpness, of course, you can go all the way to TechPan with various developers (since we are talking about Rodinal -- dilute 1:300 -- yes, 300 -- for 12 minutes with EI of 32