I doubt that! Many players who have barely gained a foothold in the NHL play big in the KHL. Also many players from the SHL and Liiga have no problems acclimatizing in the KHL. The results of KHL clubs in the Spengler Cup (yes I know is unimportant, but the frequency of failure is amazing) are mediocre. A Russian KHL team in Sochi in 2018 almost lost the final to a German DEL team (and even at home). So the KHL can't be that strong. Second strongest league in the world, yes, but much closer to the SHL than you think.
We had this a thousand times. You can't base that discussion on cases of single players. And also not on such tournaments as Spengler Cup for example.
As for the Spengler Cup, Sochi is one of the worst KHL team. It being in the final at all is telling.
Also let's not forget there are nuances for every league. The KHL for example has a bunch of perennial contenders, a bunch of bottom feeders and a rather small contingent of teams inbetween who might have a good srason and compete in the playoffs or a bad one and end up among those bottom feeders. The NHL is much more evened out through the cap. So talking about KHL top teams and bottom feeders is talking about different worlds. I was talking about average level of the leagues.
I am btw all for creating some sort of tournament betwern the leagues. It just needs to have a formula that works for everybody. Spengler Cup is not that. CHL is not that as CHL organizers wanted the KHL to pay for everything and win nothing. If there is a tournament that actually works in the future I am on board.
As for SHL and Liiga players, by far not all of them succeed in the KHL. And it is the nature of things that KHL teams usually select the best out of those other leagues. It's the same like saying Panarin has no trouble being a NHL star, so the NHL is not that good.