There has been a lot of interest here in the Edea Ice Fly, a very lightweight boot (with limited customization options), and in the Avanta boots, some of which are also supposed to use lightweight composites too.
A fitter just told me that the Harlick Competitor, using a combination of composite and leather materials, is about 1/2 ounce lighter than the Ice Fly, when ordered in the lightest form, and is available in custom sizing. Perhaps it is worthy of some consideration too, for those seeking a light weight boot.
I'm not knowledgeable enough to compare them on other basis.