Thanks for starting the thread, rogissimo. I was about to (which I generally prefer leaving to others), so will just copy/paste:
Thanks to Maskarade for this week's non-jumbo Prize. I'm not big on the jumbos, but have enjoyed his relatively infrequent 15x15 puzzles.
Found this about average difficulty, maybe slightly on the easy side. Rather a lot of UK GK required, UK residents may find it less challenging. A significant number of short low-hanging fruit clues, but sufficient complex entries to provide good entertainment.
Can't see a theme but I often miss them. The grid is amenable to Ninas but none is evident.
FOI 9. LOI 13 which I also consider COD: even though I can't fully see the parsing, something very clever is obviously going on!
Clues 21, 8, 12 and 18 also came into COD consideration.