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LG UltraFine series 5K monitors (2016) vs Acer XB series QHD monitors (2015)
No sources that do their own in-depth testing have considered the LG UltraFine 5K 27" to be a good enough purchase for it to earn a sport in their Monitor roundups, which is typically a bad sign.
As for the Acer XB270HU bprz - it wasn't considered to be a good enough purchase to earn a spot in any roundups conducted by sources that perform objective hands-on testing, which typically indicates that a product isn't worth its asking price.
As a last step, we wanted to do a head-to-head LG UltraFine 5K 27" vs. Acer XB270HU bprz comparison of their review performance but, unfortunately, weren't able to find any review ratings on either product.