Upgrade from Ortofon 2M Red to MC-1?

I've been using the Ortofon 2M Red that came with my Pro-Ject Debut TT, and have the opportunity to get a pretty good deal on an Ortofon MC-1, a high output MC cartridge.  Just how much of an upgrade would this be - what kind of improvements in sound could I expect?  My phono stage is the Bellari VP 530.  They'll be running through an NAD T753 receiver and Chapman T5 speakers.  Thanks for any opinions!