The SR2 are over 2000g. I don't have the exact number, but they are at least 500g heavier than the Hunt SLs.

In terms of ''is it worth upgrading'', it really depends on what you are looking to obtain and how much will it cost. ''Is 000$ to buy the Hunt SL worth the 000g weight saving?''. I would personally not buy alloy to upgrade alloy, but that's just my opinion.