The numbers are in from Diamond for January 2018, and they paint an interesting picture for both Marvel and DC.
Specifically, Diamond reports that Marvel Comics came in as top publisher in terms of dollars with a 34.30-percent dollar share and a 36.69-percent unit share. DC Entertainment wasn't far behind, however, with a 33.80-percent dollar share and 38.94-percent unit share. Image takes third with what appears to be a 9.48-percent dollar share and 8.23-percent unit share. ("Appears" here because Diamond's revised numbers for everything below DC look to have missed a couple decimal places, with the official table reading 948-percent dollar share for Image.)
As for individual comics, the numbers are a little more stark. For the top 10 comic books in terms of units shipped and dollars invoiced, DC took six spots each with Doomsday Clock #3 following by Dark Nights Metal #5 topping both. Marvel's first entry on both lists, Avengers #675, landed at sixth and third, respectively. The other notable entry on both lists? The Walking Dead #175.
You can check out the full list of top comic book publishers, top 10 comics books by units shipped, and top 10 comic books by dollars invoiced below.
Dollar Share: 34.30% | Unit Share: 36.69%
Dollar Share: 33.80% | Unit Share: 38.94%
Dollar Share: 9.48% | Unit Share: 8.23%
Dollar Share: 4.42% | Unit Share: 3.51%
Dollar Share: 2.50% | Unit Share: 1.27%
Dollar Share: 2.13% | Unit Share: 1.74%
Dollar Share: 1.61% | Unit Share: 2.25%
Dollar Share: 1.29% | Unit Share: 0.44%
Dollar Share: 0.96% | Unit Share: 0.74%
Dollar Share: 0.89% | Unit Share: 0.48%
Dollar Share: 8.63% | Unit Share: 5.71%
None of these numbers are terribly shocking, of course. DC's events are killing it, and The Walking Dead has opened an entirely new can of worms with its current arc. With a number of Marvel's flagship titles coming to triple-digit milestones, it'll be interesting to see how February's numbers shake out.