Really sad that 30 years later we're only slightly larger. This is a major problem for telescopes since there are hard physical limits on resolution vs size.
They both look like they might be similar sizes in an illustration like that, but the Hubble mirror is 2.4 meters, whereas the JWST mirror is 6.5 meters, which has 7 times the light-gathering capability of Hubble.
It's 2.5 times the mirror diameter, which is 6.25 times the light collecting area.
Obviously it’s sad that we don’t have a larger Hubble-equivalent by now, but the Webb’s operating temperature makes it a completely different beast. It is massively expanding our capabilities in a way a larger Hubble wouldn’t. And I’m hopeful for the mid-term future, as the massive improvements in launch capability we’re seeing start to pay off.
SpaceX Starship may help with that, assuming it works as intended.