"Bad" BDs better on your 4kUHDTV?

[Bluyoda]

Have you re-watched any of your old BDs, of which you thought the transfers were rahter poor or bland on your HDTV, and thought they looked much more decent on your "new" 4k UHD TV?
To me, most BDs show their flaws much more so upscaled to 4k, and only sitting 5.2ft/16.m away (see sig) from the screen certainly doesn't help either, but there are some BDs that I had thought were pretty lousy BDs, that actually look better on my 4k TV, and all of those are the unmolested ones, such as
'National Lampoon's Vacation', 'Armed and Dangerous', as well as 'Porky's' come to mind. They look more filmic now, as opposed to all those processed transfers, where the flaws are now amplified, and some have become unwatchable (Bean: The Ultimate Disaster Movie) now.

Were you positively surprised by any old BDs of yours?
Which ones were they?