I'm currently using a 5dmkii. It had roughly around 4k shutter count I believe when I bought it off ebay. It's in nice shape. I'm new to this forum and learn with this stuff everyday. I see these awesome pictures and was curious if I needed to upgrade since this camera was released in 08' I think it was. I don't do any studio work or use any special lighting outside. Thanks Alan!
If what you have works and you find that you are not hampered by the equipment, then I would just stay with what you have. Alot of photo results you see are post processed, and not knowing your skills or tools, perhaps taking some time with online tutorials on LR or Photoshop or GIMP, or whatever you use to see how you can enhance digital imagery might be a good way to spend time instead of money.
If you find that you have any of these situations, then the 5D2 should be upgraded:
o You have issues focusing in low light, the 6D seems like it can see in the dark, it is that good (and the 5D4, and 7D2, etc now)
o You notice that AF just doesn't always latch on and stay on target, even if you have the helper assist points turned on
o You would love wifi access to the camera to see and shoot remotely
o You want a better out of camera JPG than what you are getting (the 5D2 has an old JPG engine, the newer models produce better results)
o You want to go to SD cards
o You want longer battery life
o You want better high ISO (3200+) results
o Probably a few other things I am missing...
The later gen FF bodies really stepped up their game as a whole package over the 5D2, which was more of a evolutionary upgrade over the 5D. The 5D3 and 5D4 introduce 1D series AF, the 6D introduced a smaller, lighter FF offering with great IQ.