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Its all about how you handle your phone, if you keep it away from keys, coins, etc it shouldn't be scratched
I don't have the Xperia V but I do have the Xperia T, Z, etc which have a similar if not the same ASF (anti-shatter film) even previous Xperias like my Arc or X10, its just plastic and after a year or so you will notice small scratches here and there, which is normal, but you should apply a scratch resistant either film or glass
You might want to consider a tempered glass screen protector rather than a plastic film
Yeah it is the same size 4.3in screen