Upload & Sell: On
But here is the answer to your question.
5dii is a great camera.
- Has really nice ISO capabilities. A bit short of Nikon because they use less pixels but that's just a design choice
- Has really nice image quality.
- It complements the 7d very well - less reach but better ISO, more pixels, wider, same batteries
- If this was the end of all canon evolution, I would stop and say don't hesitate.
That said, 5dii is getting old:
- There must be another version coming. Likely 1 stop better iso (equivalent to Nikons $7000 offerings), and lots of features from 7d (weather sealing, lighter touch, less mirror slap, maybe 6fps, more stops in auto-bracketing). It is not clear whether they will move it back to 18mpx (same sensor as 1dx) or go to 30mpx.
- The question you might have is wether you would regret buying a 5dii and then seeing a better 5dii. A lot of this is just emotional. If you plan to use it, you could easily get 5 more years out of 5dii. Resolution is topping out and future resolution will have diminishing returns because lens will limit them. ISO might get 1 or stops better, but for landscapes, this is not needed anyway.
- Old 5d classics are still selling for $1000 because they are still very valuable. They are able to do as well for landscape as 5dii or d700 but don't have the iso capability.
- I think the next 5dii is at least Sep of this year away for delivery, possibly a year away.Can you wait. If you can't, and I could not for wider and better for landscape.
So my advice is that if it will bug you to have a new camera that is not the latest and greatest next year, either wait or buy the 5d classic and upgrade then. But buy one of them, because ff is way better than crop for landscape and you will miss lots of opportunties on the way.