Shame they didn't include frame times. I'll bet that the 1% frametime is still above 180fps and those minimums are during the initial load screen or something. That's the only problem with minimum reported framerates. According to Blizzard, input lag can still be an issue even with high framerates, so be wary of assuming that it's a fix-all:
http://us.battle.net/forums/en/overwatch/topic/19615281339#12
As someone who is obsessed with Overwatch performance metrics, I can be absolutely certain that at 1440p, even a 1080ti with 6700k or 7700k and Samsung b die ram at 3000-3200 cl14 with the program installed and loaded on a samsung 960 pro, that you will be unable to maintain 144fps at pure Epic Settings.
A normal 1080 with a 7700k on 1080p cannot maintain 144fps on pure epic settings. At best its only able to handle ultra with some epic settings to prevent minimums below 144. The increase from 1080p to 1440p is roughly equivalent of the jump from a 1080 to 1080ti. Dropping below 144fps would likely occur whenever you run into a large group. It won't be a significant drop, but it will occur. If you do not care about 15 fps drops during intense action, then it should not be an issue.
The only possible way MIGHT be a truly maximal OC on all the fastest gaming parts.
A 5.0-5.2 7700k with 4.8+ uncore, 1080ti Manual OC to the max(including Memclock), samsung b die OC to 3600 - 4000 with best equivalent Latency, all unnecessary background programs inluding antivirus turned off, with OW and Windows loaded on a samsung 960 pro 1tb using a specialty board like the maximus apex, cleanbooted and having updated with the Latest drivers for all components. Even then I am not 100% positive you could prevent drops below 144fps on Pure epic settings at 1440p. I am also not talking about framedrops that occur once every minute. Rather I'm defining framedrops as events involving lots of players in intense action.