Yep I understand. I've had a few rides on the CBR900 ages back never rode the ZX7R so I cant tell first hand how the chassis and stability would feel. I do like the CBR900 and it started the whole modern Blade revolution and for its time it was an awesome bike, even stands out today.
I guess as with cars everyone has their perference about bikes too and unless you are a hard core professional track rider all the litre/600cc bikes are similar in their class in terms of handling and performance except ofcourse in how they appeal to you.
Anyways mate, ride safe, wear good protective gear, and hope you have great fun with the bike