Beautiful. I'm not normally a big fan of Ultramarines, but yours are quite nice. The highlighting is much more pronounced than your previous Ultramarine Captain, which allows the weathering to show up better (contrast), and each armour component much more defined in the pics. A huge improvement, and I can only imagine how happy your client must be to field these on the gaming table.
If the lenses on the helmets were done up a bit cleaner (glass / gem effect), it would contrast nicely with the dirty armour, and make the faces a better focal point.