I currently still own two 7.3 Diesels, NO WAY would I compare them to a modern 6.7 Diesel. My 7.3's have been well maintained and I couldn't afford to have a new 6.7 Excursion custom built. It would be so nice to have the quiet and all the extra power. I will say my 7.3's have been as reliable as a anvil.
Forgot to add the 7.3 truck with manual transmission gets 21mpg highway, not to bad for a 3/4 ton truck.