I went to YWM again over NYE, the result was a pretty nice sports jacket, Italian fabric (Vitale Barberi or so..), 4200 HKD, I also bought a couple of shirts (750 HKD on average), but am too lazy to take the pic's now. The jacket has a perfect fit and feels extremely comfortable to wear. I also went over to AMHC for a few more shirts (1.100 HKD on average but all are Sea-island and feel absolutely fabulous), pretty nice quality. AMHC had done soft collars and cuffs at first shot, whereas YWY made pretty hard ones, which I didn't like. However, after asking they are now making soft-collar/cuffs, too.
My experience is really that AMHC is top-end, everything is a bit more professional/better (location, quality, fabrics, sewing, classic British no-BS style, well organized clean shop) and therefore charge around 25% more on average. YWY seems more humble, the shop is a bit more "local"/unorganized. They have a lot of suits in the making when you go there, so it seems they have an old established clientele. Both were my first bespoke suits, so I made a couple of initial mistakes, but now I feel I know how to handle (cloth, cut, sewing, lining, number of fittings, shoulder-padding, soft shirt-collar/cuffs, sea-island vs. egyptian cotton, etc.)
The only problem with the HK tailors for me is that they always recommend cloths that are targeting customers from HK, meaning they are very light unless you specifically ask for something more heavy. I was intending to use this jacket as a winter weekend jacket, but it's in essence a spring if not even summer jacket, very light, might even have some cashmere in it, not sure.