Depends a lot on your site. The large publisher that I work for sees more traffic from Safari/Webkit than Chrome (42% vs 40%) due to mobile traffic on iOS.
>Safari has about ~5% percent market share on desktops, but 15-25% on mobile, including tablets.
Depending on Region, it could be up to 15% on Desktop and 60% on Mobile, including tablets. Most people don't realise the devices usage market shares from iOS is actually much larger than they thought.