I sold my 7D about 5 years ago. One of the biggest mistakes ever. I look at the photos I took with that camera and shake my head with disbelief that I ever sold it.
Not being able to shake it, I recently purchased the 7d Mk ii. Even though its at the end of its life cycle, Im still glad I bought it.
Having two card slots, 10fps, much lower noise than the 7d (fast sports in poorly lit gyms were a pain with the original 7d) are all fantastic upgrades. Im not a video shooter so the video is a moot point for me.
So I say yes it is still a good buy. The 7d mkii is, and will continue to be for years, a quality camera.
Having worked through the following range of Canon DSLR's - 350D, 40D, 50D, 7D, 6D, 7DMkII, 6DMkII, I am in a good position to comment.
The 50D is a bloody nice camera. I had to just about prise it out of the wife's hands to move her to the 6D (we had a trip planned with indoor no flash photography in Museums etc, and knew the 6D would perform much better and didn't want to part with the 7D of mine to finance it). It's natural feel of every control in the right spot and great IQ hasn't been forgotten.
My initial move 40D > 7D went through a bit of a confidence struggle. It was probably the jump in MP and me viewing things at pixel level to judge how sharp I nailed it. The higher MP camera's capture that much detail that nailing it razor sharp like we did in the 8-12Mp days makes you think your hit rate has dropped, even if it hasn't. I'm sure I wasn't the only one who went through a learning phase, and missed the "lazy brain" portrait, landscape, sports etc. and actually had to think for myself as to what aperture etc. I wanted for each shot.
My jump from 7D > 7DMkII had no such issue. I suppose I had already accepted that pixel-peeping would cause self-doubt, and had got used to the 7D. The better AF and pretty much everything on the move was a confidence boost. It's way more than just a MkII badge and a bit of a fiddle with the spec sheet. I don't regret my transition through the 7Das it helped me learn things, such as to concentrate on the shooting technique instead of a "she'll be right" attitude. I needed discipline to follow-through on the shot like a rifle-shooter, not wandering off for the next shot and snatching the shutter in the process.
7D really needs good light. Whilst I have pushed it all the way to 12,800ISO in caves it was very evident that 3200 was fine, 6400 was more the practical limit, and suffered in muted colour. In a nutshell, I stopped trying to take shots in low light as the missus would shoot all the keepers with the 6D. There was almost never a shot of mine that would be a keeper in comparison.
The 7DMkII on the other hand will happily go to 16,000ISO (Native) good enough I let the Auto ISO have that as an upper limit. Yes, I have tried the 25,600 and the 51.200 (Bad, but marginally better than the 12,800 of the 7D. And whilst the 6D's (&6DMkII's) images normally beat mine for IQ, the margin is closer, and sometimes I have photo'd something that she walked past and with PS and NR software I have got some good keepers. And the AF improvement in low light is noticeable. I frequently would nail AF with my favourite lens (17-55mm F2.8 IS Canon) and her 6D would struggle even with the 50mm F1.2. So it was a big difference. Having said that, the 6DMkII kicks it's butt in low light AF by a noticeable margin. It's bloody near psychic, and that's on the F4 24-105 lens!
In short, I'd certainly say go the 7DMkII over the original, even if that means (temporarily) forgoing better glass. Because as people rush to the new Mirrorless glass, there will be quality L glass coming onto the second-hand market.