The OTA channels generally look better than they did on DirecTV, except when there's lightning. I'm pretty sure our local CW, Fox, and ABC affiliates are broadcasting GOPs that are *way* longer than 15 frames (IBBPBBPBBPBBPBB), because noise bursts (like nearby lightning) seem to derail them and make the picture & audio fall apart for at *least* a second or two.
What ATSC *should* do is keep the same 8vsb transport layer, but allow broadcasters to use their 19.2mbps link budget to send a primary MPEG-2 stream (compatible with current standards), but use their remaining bits for one or more h.265 streams (with faster error-recovery than we have now). That way, they could launch it with a single SD h.265 stream at the tail end of each data chunk, then drop the primary stream's bitrate to 6-8mbps (using the balance for the new h.265 stream), then move the subchannels from MPEG-2 to h.265, and finally drop the legacy MPEG-2 primary stream down to SD bitrate & reallocate the bits to the primary h.265 stream (enabling 1080p60, 1536p30, 2160p24, etc... maybe even native 24, 25, 48, 50, 72, or even 100fps streams, if they can get TVs to handle on-the-fly mode changes like ATSC was *supposed* to (but apparently doesn't, since NO OTA station I'm aware of changes modes on the fly today). It would be kind of nice to be able to watch British TV shows at 720p50 or 1080p25 without telecine judder like we have now, and 720p100 is a *visible* step up from 720p60(*) (at least, when viewed side by side, 720p100 is clearly smoother).
(*) 120fps is visually indistinguishable from 100fps... the next visible step up from 100fps requires 150fps for high-contrast motion, and 200-300fps to see a difference with lower-contrast content. Since 100fps is as good as 120, we might as well go with 100 & make everyone's lives easier going forward).