Well, since I am not in the market for a Canon anything and I'm also not planning to buy a Sony 70-200mm f/2.8 GM II for a while (if at all), I can wait.... But that is a good point, as most people do tend to want to see and handle a new lens, especially if it is a brand or focal length new to them. I've handled most of the lenses I've got now prior to having purchased them, the exception being the Voigtlanders since no one around here carries them. A couple of the less-expensive Sony (non-G) lenses in standard focal lengths with which I was already familiar anyway such as the 85mm f/1.8 and the 35mm f/1.8 I did buy without bothering to handle first.
AFB, your company REALLY needs to start selling Sony! THEY've got plenty of lenses to offer prospective customers right now.....