Not going to get too excited until the season is over, but that's elite performance for a 19 year old goalie in the KHL. Not just 19, but an August B-day.
At 18-19, (Dec B-day) Shesterkin was splitting time between MHL/VHL/KHL
At 19-20, same, VHL 25g .954
At 20-21, KHL 39g .937, PO 5g .940
At 21-22, KHL 28g .933
At 22-23, KHL 28g .953, PO 10g .904
23-24, AHL 25g, NHL 12g, starter the next season
Sorokin
At 19, KHL 32g .906
At 20, KHL 28g .953, PO 20g .945
At 21, KHL 39g .929, PO 7g .916
At 22, KHL 37g .931, PO 18g .930 (probably NHL ready at this time)
At 23, KHL 40g .940, PO 20g. 947
At 24, KHL 40g . 935, PO 4g .966
At 25, NHL 22g .918, PO 7g .922