Doesn't apply, there's no such thing as a "standard pour" here. In Swiss restaurants the glasses and pots are calibrated, if you order 2dl that's exactly what you get.
Without wanting to go all Tom, I was at a restaurant in St Gallen last week where not only were the prices per dL pleasantly cheaper than Zurich, but my DL pour was straight from the bottle and more like 1.5dL
I think the answer is pretty obvious: Swiss consumers arent very price sensitive, but that does not mean they are completely ignorant of them - its apparently the 10 CHF mark every bar wants to avoid... so they portion the wine accordingly that a glas costs some 8 CHF even in downtown Zurich. Some bars like Moevenpick go so far that the price remains around 8CHfs, but the amount varies depending on the wine. Some come in 10cl, others in 15... so no matter if you buy cheaper or more exoensive wine, a glas is about the same and the amount varies.
P.S: Went to a wine tasting with some Swiss friends here at the Mosel and they were shocked that you can get good quality white wines from small batch producers for 6 EUR a bottle...
So if 1 dl is a normal drink: Why do wine bars in Zurich sell the cheaper wines in portions of 1.5 dl and the more expensive ones in 1dl? Surely the alcohol level is not 50% different between the cheap merlot and the good one...
I will align with the Italian guideline then .... unless you have an even better one.
I don't remember seing many people drinking "Tschumpeli" as seriously it's a sip = just a tease. They must have tried to serve me that at one point though as I automatically always order a "Zweierli". (2 dl)