I haven't compare them but there's people around this thread and in this forum that say it's indeed a step up, how much of a step up it is?, well I think we're entering the realm of ever increasing diminishing returns, I don't imagine the V222 or the MJ3 being several times better than the S17, it's going to definitively be an upgrade and a noticeable one but I imagine it's going to be like moving from a RTX 3080 to a RTX 4080, reaching for comparisons to the pc gaming world, there's a measurable increase in performance but it's not something out of this world. You have to keep in mind than when people in this forum say something it's way better, we're talking about audiophile differences, that means, if you grab a person out of the street and put a pair of headphones on their head and ask them to tell you the difference between this amp and that dac combo vs this other combo, they're not going to be able to tell you there's any difference at all, people are going to stretch A LOT how much "sound quality" and "performance" you're gaining moving from x or y electronics box over to this other you currently have, 30%, 40%, 50% and even more when in reality this are more like tonality shifts and slight improvements at best to suit different tastes and we're most likely just dealing with increases in actual performance that might just barely be above margin of error, if even that.
So unless you have a very specific reason why you need the upgrade for your specific use case, besides FOMO or audio nervosa, don't fret about it and be happy with what you currently have.