i dont think the specs are similar. i play the yonex andi can say that it is very solid and manuevrable. you would not feel a bit of the suggested swing weight, it is very very fast. the same goes for the head size you will feel that its a 95"
didnt try the volkel to give you a precise advice. but the 89 is truely an amazing racket.
Vcore 97 310g