Much depends on what you define as a professional, we could debate that point alone for years.
At it's introduction, the 7D was a solid camera with reasonable IQ and handling, excellent speed and fair AF. It had it's draw backs though, the high ISO IQ was fair at best, I found it to produce soft images generally, and the AF would miss too often to be completely reliable. I had 2 of them, thinking the first one might have been a bit of a lemon, but the 2nd pretty much performed the same as the first, so I just figured that was just what the camera was like. The best thing the camera had was durability and ruggedness, but it was no match for a full frame (as no cropped sensor really is), and even lagged in IQ to it's contemporary Nikon cropped sensor counterparts (D300 and in particular D7000). For a hard working professional, it was at best a backup/emergency use camera. Not an everyday camera that most pros would pick as their preferred number one camera. For a couple of years I used one as a backup, 2nd body to a 1DmkIII for wedding photography. The IQ of the 1DmkIII was clearly better, as was the AF. The only thing I preferred about the 7D was the lightness in weight, and when the photos became less important I would switch to the 7D to reduce the wear and tear on my wrist after a long day of shooting. When the 5DmkIII was released, it immediately replaced the 1DmkIII, and the 7D was soon replaced by a 6D when those came available.
I could be interested in what the 7DmkII has to offer, the positive reports on that camera certainly make me curious. A few less than positive reports do make me cautious, however, and I don't expect it to really match the IQ of a full frame. But the AF does intigue me, and in better light situation, with the right glass, I would expect it to be adequate at worst. The 7D was only barely so except in the most ideal conditions, IMO.