's definitely an improvement on the first blade , 
(ROOT (S (VP (VBZ 's) (ADVP (RB definitely)) (NP (NP (DT an) (NN improvement)) (PP (IN on) (NP (DT the) (JJ first) (NN blade))))) (, ,)))
(ROOT (S (VP (VBZ ) (ADVP (RB )) (NP (NP (DT ) (NN )) (PP (IN ) (NP (DT ) (JJ ) (NN ))))) (, )))