Everything is a copy in this hobby.  That said, I really don't see the similarity with the spark at all.  they are about as similar as any other two recent electric designs out there. 

I just wish there were more "copies" out there.  Anyone want to "copy" the Miss Wind bipe??   How about the "Amethyst"??  I'm waiting.  I guess you could say that they were copies of the Adventure or Narlar?  Anyway, I'd love to see some "copies" of those.

I think "copies" of airframes are the best thing for our hobby.  They all add variety and push the development progress along.  We'd be in a pretty sad state if it weren't for "copies".