MI doesn't share much information on the display part for any of the models. If there is any official MI store near to your place. Try to visit it or call them if they have that model so that you can have a touch and feel of it. Generally, MI tv's are inferior when we compare with Vu on display and sound quality.
Vu premium and ultra are having the same specs. only difference ultra has HDMI cec. If pricing is same then go for ultra.