SEV said, how much superior is SEV's chip, that's a really good question that I don't think anyone here has the direct definitive answer to yet
BUT.... I do recall in an interview that RH when talking about S7 ACC's versus the competition, pointing out that S7 chips would very likely be superior because of how complex the innerworkings of the chips actually are, and how much time S7 had spent in perfecting these chips, RH said as such that it would be very difficult for these competitor companies to be at the same level of performance as S7 chips
and could the competitors even replicate the performance without infringing on the S7 patents?
this is why I believe that S7 likely will either be involved in a JV Agreement with the likes of MACOM etc, or ultimately just be an acquisition target
also, I think the problem in the past preventing ACC's from getting implemented has been the extension of the life of the passive DAC (mainly by the developments of the Tomahawk series of Switches), but at 800gbs finally the passive DACS Reach becomes to short at 1.5M to 2M max