The resolution of a digital sensor is definitely higher than film...but one thing that a sensor hasn't been able to touch yet is the tonal range offered by film. There's just something about the way that film handles a range of light that's kind of magical.
I started shooting a lot with my medium format (Mamiya 7ii) again about a year ago after a bit of a lull, and it's been really enjoyable to on occasion move away from the typical "spray and pray" of the DSLR. I don't do the darkroom processing (a combination of not having time plus them being rather toxic) and send it out to a lab in Utah (
www.thefindlab.com if anyone is interested).
It's definitely not cheap (about $2 a frame!), but it's been really fun, and the best part is the anticipation and surprise that you get from getting those scans back. It's funny how when you only have 10 frames per roll, how you anticipate each and every one of them.
I love my D800, but the Mamiya is a really nice reprieve at times. It's kind of rekindled my love for photography in many ways.