Having travelled in Mk3s, ICRs, and Cravens(i think), i would have to say that the MK3s were very comfortable, and i think the cravens were comfortable as well,( cant remember fully, it was a good while ago) But on the case of the 22000 class ICRs i find them reasonably comfortable. the only real problem I ever had with them was leg room, but i have grown used to this as they are vastly superior to other railcars, such as the 2700 class.