No. Not once.
However, whenever I shoot for a new client it is more frequent than not, that the client comments or starts a conversation when they see the Alpa setup. (mostly interiors)
Not long ago I had my 32Hr converted to FPS mount and at the same time got a prestige assignment of shooting interiors of a villa costing 28 million euros. I turned up at the location with my Sony A7r mk1 and a Loxia 21. I felt 'very' naked, vulnerable and small....
I had prepared a defense if confronted with this setup, but that didn't happen. End result was a happy client, but I don't want to experience that again. Not in a place like that.
Bottom line is that in my case, the Alpa setup on location reinforces confidence with the right choice of photog from the clients perspective and I believe it is a combination of end result and this setup that gives me the next assignment.