I've said this before but Edmonton 20 years ago had a similar skyline to SLC now: tabletop with tallest buildings around 125-140 meters (406-460 ft). Edmonton probably had a few more residential towers and they're a bit more concentric whereas SLC is spread linearly along Main Street, but it's not not worst comparison.
They've recently added the 822 ft Stantec Tower and a 626 ft JW Marriott and I think it looks great. Stantec has a mini-Sears Tower effect due to the density of the surrounding buildings.
Picture from 2017:
Picture from 2020:
So with the addition of the current set of towers U/C in SLC, and given the right location, I don't think an 800 footer would even look bad. 500 ft or 600 ft would look great.