[quote=@Andromedai]
According to Halopedia and a couple other sources, Spartan IV's in MJOLNIR GEN 2 armor allow them to keep up with Spartan II's.
[/quote]

I would hope most the Spartan IV could keep up with the 45 year old Master chief. I'll have to edit my post to mention it, but I wanted to compare them in a very balanced way. For example if we forget Gen 1 of the armor or the time piece of the conception of the others, the list still doesn't change since it's the armor that even lets the IV's compete with the others. Besides the age thing I think any of the Spartan II and IIIs in their prime still are gods compared to the IVs.