Exact same data as this image, this one was at Dorn Creek and is stacked from 56 30" frames, ISO 800, with a Pentax-A 50/1.4 at f/2.
The difference is in the stacking alignment selected; here, I used Deep Sky Stacker to align on the comet, rather than the background. That's why the stars look so blurry; the comet's head and tails, however, are much sharper, with visible detail in both the ion and dust tails.