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I really like Kopinski for a couple reasons.
First, I'm a sucker for a good inker. And from a technical standpoint his work is excellent.
But mainly, he got the right amount of over-the-top in 40k. Much like Ian Miller, everything is giant and ornate with Kopinski. But not needlessly so. You really feel like it's a baroque future/med-fan society, and not just some random gubbits glued everywhere to look cool.
Looking at the OP, you can see the groups' identities. The flagellants are criminals and heretics made into killer cyborgs, and such they're branded, have drug injectors, and an overseer whipping them. The repentias are zealots craving redemption, so they're unsupervized but have horrendous self-inflicted wounds. It's the far future so even the lowly preacher has some induction ports, and the pulpits have servoskulls on them...
He really thought about how that army would be composed, move and fight
Also he's a man that drew a lot of historicals, and as such makes pretty decent formations and battle scenes.
Btw, did you know he did the art for several 40k comics, most notably the Kal Jericho ones. It's a notch under his regular artwork (I suppose time was a major concern), but still plenty good.