The Gen1 and Gen2 busas are different, but the lineage is unmistakeable.
Here's a link to an article I wrote a couple of months back for Rider's Review.
At this writing I have 60k miles on Gen1 'busas and nearly 17k on my Gen2.
I would most strongly recommend the Gen2; it's definitely an upgrade on what was, in my opinion, the most significant motorcycle in sport-bike history.
https://www.hayabusa.org/forums/?act=ST;f=77;t=93159;hl=
Scar