The Redmi phones - not Redmi Note, not Redmi K, just the base series - is the baseline for Xiaomi phones, a distillation of the most important features wrapped up in an affordable package. By their affordable nature, they move slightly behind the times, but the Redmi 9 is still a major upgrade over what came before it. For starters, the screen now has 1080p+ resolution, no more slumming it with 720p+. Also, the diagonal was adjusted to 6.53" (up from 6.22") to make better use of the higher pixel count. Powerful chipsets have proven their ability to draw in potential buyers, so the...
Source: https://www.gsmarena.com/weekly_poll_redmi_9_does_more_but_also_costs_more_than_its_predecessor_did_xiaomi_mess_it_up-news-43712.php
