I watched less Liiga games than previous years but I saw Hemming 10+ times nonetheless and another 5 or so practices.
Hemming's play at Liiga this season was pretty pointless and eventually he returned to U20s. He would have maybe 5 times to defend in his owm zone and another 5 chances to try and create something from a dump since no one on the line could connect a pass tape to tape. Experience vs men, sure, but that's it.
Currently Hemming is the 2nd leading scorer for U20 club in playoffs where they reached the finals. A case of the team loading up U20s with some of the guys who already played games in Liiga. They have 4 guys who put up PPG+ this season or already last season.
There's YT video of his shifts vs Ilves in Liiga which was probably his GOTY. Shows what he could be, playing with that team's best playmaking center for most of that game. Rest of the season, after his 5th or so game, he spent on the 4th line playing 7-10 TOI. Not really his fault but it's a pro game and their youngstrer line was split up and he got the short end of that stick.
Other recent second wave finns include: Räty, Koivunen, Tuomaala, Heimosalmi, Hirvonen, Järventie, Kupari, Ylönen and Luostarinen. Some, if not most of them should play in the NHL at some point. So that does speak for Hemming as he is mostly on par with all of them, none were really breakthrough players, especially with size like Hemming has.