The 620 is what I ended up ordering. Of course, I'm pretty sure the others will follow at some point. But in the meantime the 620 seems to be the favourite amongst face latherers.830 is an 1305 with 10% more hairs if I'm not mistaken.
Personally I prefer the smaller lofts (50mm vs 55mm), so that means the 620, which is actually my current favourite brush.
It will get very very soft (but can take a long time to get there).
You're actually not the first saying that a semogue died after 2/3/4/5 years of use. I have lot older omegas that still performs like day 1 (of the break-in period). Nevertheless, I couldn't bare the weight of my curiosity anymore. Besides, that is probably one of the perks of owning more brushes. They should last longerI had a 620. Great face lathering brush, that eventually got soft and was a real pleasure to use, until it died after a couple of years use. It would kill the lather after the 1st pass. There’s a thread here somewhere here that instructs on how to clean & revitalise brushes where this occurs, but after several attempts I gave up. Still worth buying for £15, I enjoyed & ultimately got vfm using this great brush.