What he's saying may be true, but I've taken a product pic and for testing purposes I used Canon 10D (6.3 MP), Canon A2E (35mm with Fuji Reala), and a Bronica medium format (can't remember the film I used).
The 10D and Medium Format can be blown to 20"x30" no problem (Medium Format had the edge), but not the 35mm film. My personal conclusion: 6.3 MP offer more resolution than a 35 mm.
In a very similar situation, just before I sold my Bronica, I took another picture using 5D (12.8MP) vs the medium format. Enlarge it to 40"x60", without post processing, of course. Both came out blurry, but the 12.8MP camera yields far more acceptable result than the medium format. Hence I sold the medium format.