yeah its not much, but i had a run a few days ago that was over 1 sec ahead going into the final boss but i got trolled by him hard and didn't get the 4 round :/
http://youtu.be/D1U5W0fvI9w?t=2m35s
I have done some boss rush runs, but that's just not really my style. There are actually quite a few people I know who do/have done full game runs, although I was about the only person grinding out attmepts. You'd be surprised at the amount of patience people have for speedrunning games; cave...
http://www.youtube.com/watch?v=sin7PZKkXfw
So I started doing full game speedruns almost 2 months ago and got (what I believe) is a super good time. 28:41
Timer starts at 'OK' and ends as soon as you kill the final boss(http://i.imgur.com/HCTlqfn.png)
This run had nearly perfect RNG in Hekichi...