The only reason I sold my hyper 7 and got the 777 was the sharper steering. My track is kind of technical and the guys with the K3's where killing me in the corners. This is the only difference I can see from the new kyoshos and the lower end cars. The car isn't as light as I hoped but it is very easy to build. I too had an Ofna 9.5 but it was way too heavy and couldn't accelerate fast enough. The 777 in contrast with the Ofna 9.5 is much snappier. The suspension is smoother. But the world of the two cars are very similar. I believe Ofna copied the cosmetics of the kyosho 7.5 but didn't copy the R&D. So if you went from an Ofna 9.5 to a K2, you probably will feel as you still have the same car. I equipped my 9.5 with Kyosho shocks and a Kyosho body, and people thought I had a K-car. I was kind of disappointed because my 777 reminds me too much of my old 9.5. I want my hyper look back.
But all of that is just cosmetics. Ask around about the Xray or Prospec if you want something totally different from what you have now. Just my 2 cents.