Sorry to be a buzz kill, but I simply do NOT get these types of questions at all. Is this an attempt to generate some sort of rambling controversy?
Studio resolution. What, on a computer screen, zoomed in ten times, is that what you mean? Or do you mean digital files converted to prints that a customer might hang on a wall?
If it's the later, then it all depends on PRINT size--4x6, 8x10, and so on. You can only cram so much discernible data onto a given area and, as far as I know--could be wrong here--35mm slide film is about (I'll give a range) 20 to 25 megapixels, so, unless you're addicted to your computer screen, what more do you need?
I would say from the "tone" of your question that you're:
A) obsessed over megapixels, or
B) spend way too much time sitting in front of a computer, or
C) don't do prints under, say, 20x30, or
D) all of the above.