For a hero or lord they should be fine. GW uses what is called "Heroic 28mm" which when compared to regular 28mm models, GW's look bigger. So a 32mm should be fine. Your lord will just be larger, more muscular, the perfect leader for an army.
Now, if you are playing an army with smaller models, skaven come to mind, the lord may look huge. Any elf, human, undead, ork, lizard armies should be fine though.