Differences
If you go to Yachtworld and look up Hunter 28 you can see pictures of the two. Biggest differences are that the 28.5 aft berth runs for and aft while the 28 runs across the beam. The 28 has a sugarscoop stern and is a fractional rig while the 28.5 is a masthead. I also think the 28.5 has more storage in the cabin above the seat. Perhaps a little more teak.