I’m a big fan of 10/12mm for many periods including WWII. I already have so much Pendraken & Pithead metal, with a smattering of Minifigs, Takara and Dragon, that I’ve not gone big for the Victrix range. I have a couple of tanks and a good chunk of their German infantry.
Despite being called 12mm they fit great with existing 10mm - if anything the Victrix figures are a lot more slender than metal 10mm figures.
I think given the pack sizes for Victrix I’d like them to be a bit cheaper per model - as at the minute they are at least the price of metals, without the flexibility of purchasing. And I do get in 10/12mm you often want lots of vehicles, but not always.
On your PzIVs there seems to be a lot of shine under the decals - this tends to be down to tiny trapped air bubbles. Try a layer of gloss varnish on the side of the turret, then add the decal. Let dry and then matt varnish.