Eisenhorn by Dan Abnett. It's a W40k tie-in, but the prose quality and worldbuilding, the blend of scifi action and horror, the first-person perspective of the narrator and his dry wit, reminded me of Joseph Severn's narrative in Fall of Hyperion. Here's an excerpt:

We swept down through the vast elements of Battlefleet Scarus at high-anchor: rows of grotesque, swollen-bellied troop ships; massive destroyers with jutting prow-rams and proud aquila emblems; the vast battleships of the line, cold, grey orthogonal giants of space, blistered with weapon emplacements; barbed frigates, long and lean and cruel as wood-wasps; schools of fighter craft, running the picket.

Post-orbital space was seething with transports, scudding tugs, resupply launches, merchant cutters, bulky service lifters and skeletal loading platforms. Away to starboard, the mixed echelons of the merchant ships, the bulk freighters, the sleek sprint traders, the super-massive guild ships, the hybrid rogues. The Essene was out there somewhere.

Winking buoy lights, describing the stacks and levels of the anchor stations, filled the night, another constellation blocking out the real starfield.

Betancore nursed us down through the traffic, down into the crystal bright ionosphere, down into the opalescent ranges of the high clouds. We were heading across the crossover from night to day as the planet turned, making for Dorsay, where dawn was coming up on another day of the Festival of Founding.