Now with the release of HBO Max their new and improved steaming service has a much nicer picture.
HBO Now only maxed out at 5 Mbps, HBO Max can provide streams with an average bit rate around 10 Mbps. So expect to see shows and movies approaching 4K with their new service.
But as good as it may sound, Netflix has been hitting 16 Mbps on some of their original series. Which is quite impressive. Hulu has been able to provide 4K streams as high as 12 Mbps.