He did 26/4/5 on 44% shooting. 3.5 box plus minus, 2.5 VORP.
Luka did 28/8/9 on 48% shooting. 6.7 box plus minus, 5.0 VORP.

Also, Donovan's three best teammates are a Defensive Player of the Year/All-NBA big man, an All-Star PG, and the Sixth Man of the Year. Luka's best teammates are Porzingis, Tim Hardaway Jr., and... Dorian Finney-Smith, I guess?

So it's not much of a surprise that Luka has more hype than Mitchell. Mitchell is the best player on a very, very good roster. Luka's currently a one-man team-- yet he's still hyper-efficient and still ultra-conducive to winning.