If a place has a service fee, that's a mandatory tip in my view, so I won't add yet another tip on top. And I won't be coming back to that restaurant.
If they have a service fee, I hope they at least count it as a tip.
I've never seen a place that does that, although maybe they exist. The restaurants where I have seen service fees usually even put in the fine print something like "service charges are not a tip"