You now need to explain what "top sound" means.
This question has way too many "it depends" factors. Is the source track sounding pretty good? Did you bood enough time to realistically have the time to mix it well? Is the studio well equipt? Does the engineer have good skills? Did YOU get in there and start making "helpful suggestions" that are not very helpful in reality? Did the engineer even give a shit about your mix?
Too many "it depends" factors. Just because the studio is "for hire" doesn't mean that the situation is condusive to the final project sounding "pro" (whatever "pro" means....). I have mixed stuff for people that have tracked at home. Some of it has been a little surprising (in a good way), but mostly, the audio usually has some problems that keep the final mix from sounding as good as it could have had it been tracked by me, or another skilled engineer.
Ed