A lot depends on the quality of the bodyshop and its equipment. No matter when I discuss this I am always told that the bodyshop in question is top notch and does work for the Queen blah blah blah, but that fact remains if you go to a bodyshop in a backstreet garage with no dedicated passive certified paint booth with proper extraction and proper curing facilities then you will not get as good a job as one that does have that sort of set up no matter how good the sprayer.
That's why some cost £500 and some cost £1500 for the same job. If you are happy with the finish and work from the £500 shop go for it.