Yes i do agree the light bleed, IPS Glow and blacks (More like Greys ) were crap on my PG34QAt that time I've used LG 34UC98, which had AW3821DW-like picture quality already in late 2015, while other ultrawides looked like this (that's your PG348Q by the way).
But how much this was due to it being an IPS panel and how much is was due to the monitor build quality i don't know as IPS panels are know for glow & crap black levels but they do have great viewing angles