I've seen a series about the MKI pilots, and the level of training is on par with US training, so to say that a MIG-21 could splash a SuperBug is just semantics, without looking at the capabilities.
SuperBug: Newer, more reliable, and can carry a higher amount of weapons, vs. the MIG-21-93s, even with R-77s, can carry only two. The SH can carry up to twelve AMRAAMs. It can just do more, and far more maneuverable, and has improved close combat capabilities with the newer AIM-9X and JHMCS. The MIG just doesn't have the cockpit visibility, even when going up against the E SH.
MIG-21-93: It's great because it's updated with Israeli electronics from Elbit, as well as other countries. That's it, it's updated. The concept has been around since the beginning of the Cold War. Even with wing tanks, the operational range is shorter, and the radar isn't on par with the Super Hornets. As said, it's old and still around because nobody can probably afford something like, the Gripen.