I ordered a Fullsix lower belly pan in matte. It was perfect in every way. Fit just as the stock, no defect or issues at all. I ordered Ilmberger side fairings and nose, from another vendor. The sides arrived with visual defects. Could have been shipping related, I'm not sure. The vendor, Motivation Accessories, thankfully took it on themselves to inspect the parts prior to sending them to me. Replacements would have been a long wait, and again thankfully, they refunded me.
IMO, Ilmberger more closely matches Ducati, as Ilmberger makes Ducati CF. But, I don't think it matters. You can easily use a mild car polish to bring up the gloss level of Fullsix to Ducati CF. I'd consider Ducati CF to be a more satin as opposed to Fullsix's matte.
Motocomposities out of Canada also offers CF in matte which matches Fullsix. But, you may have to do some fiddling to get parts to work. A tail and wings I bought from them fit without issues. A lower belly, sides, nose were failures. A battery cover needed some modification to fit, but it wasn't that bad. Visually, all of the parts looked amazing. The issue was fit. Consider the price they sell a set of CF wings for. There's good value there.