Some rather disjointed thoughts on hills
Yeah, climbing, the old problem.
Don't hate hills. (Easier said than done, I know.) Treat them like, say, putting money in savings. Not really fun in the short run, but in the long run, really good for you. And in the meantime, you get to walk around feeling smug.
I don't know how much your bike weighs, but I'm almost positive it weighs more than your DF. You will be slower up hills. How much slower depends on you.
You speed profile on a 'bent will more closely resemble a tandem. Slower uphill, faster on flats, and much faster downhill. Rollers are a gas.
Gear down and spin like crazy. And point your bike at hills every chance you get. Hills yield to practice. The up side is that you now get to enjoy those lovely FAST downhills.
There was a great article over on BROL about hill climbing about 6(?) months ago, but it's hidden away in some dark corner now and I was unable to find it. If you have time...
I don't blame you for not giving up on the DF. Both your bikes have their strengths (and weaknesses). Choose the right tool for the job.