Totally agree with Dietz. Vincent please also note that VSL is recorded dry, to give you total creative freedom. The major difference between an orchestra sounding like "mozart" and an orchestra sounding like "Hans Zimmer", is in the mix. The instruments are all the same. In my humble opinion I think that the VSL collections include all the possible playing techniques, capturing every single nuance, and are the finest. The engine's programming abilties are very flexible and simply uninque, especially with Vienna Instruments PRO. MIR is what gives breath and life to the samples, among placing and further mixing control just like a scoring stage with a control room. In order to get a more "Hollywood" sound I like to use Vienna suite as well. With plugins like these you can isolate unwanted frequencies, bring out new harmonics, get more punch, make certain performances sound smoother, etc.. etc... I hope this helps a bit. :)
Also you can listen to some demos in link below. The orchestral sounds are all from VSL, inside MIR and with Vienna Suite plugins inserted.
http://soundcloud.com/damian-mizzi