I'd tend to describe it as about the granularity of Tri-X (or a little finer) with a softer tone curve response (less steep gradient through mids relative to aim gamma, less shouldering, to my eyes at least - didn't feel a need to measure), at least in D-76/ ID-11 - and as Koraks says it's 2/3 stop slower than HP5+. Sharpness is a little lower than current TX, HP5+ feels a bit sharper too. For what it's worth, I quite liked its balance of tonalities, grain etc.