The easiest way to measure motion theoretically is by running a common tv review test: based on the horizontally scrolling lines in Chapter 31 of the
FPD Benchmark Software test disc. You can't natively have any more than average 300 lines of motion on an LCD or OLED, for that you'll need a plasma.
So with LCDs/OLEDs you get technology that
helps motion appear better according to our crappy human eyes.
- Frame interpolation - frames are predicted in advance and inserted between each real frame to make them seem smoother. This causes soap opera effect and motion artefacts.
- Frame insertion - blank black/red frames are inserted between frames very fast paced. The higher the setting the more blank frames can be inserted. The higher the panel Hz and backlight hz the more frames can be inserted. This smoothes out motion without adding soap opera effect or artefacts like interpolation does. It does however darken the image and to some people the flicker is to bad, although the latter issue has improved a lot in the past couple of years.
How every tv manufacturer implements this tech is different, some do, some don't, some partially do, most do more on higher end models. How strongly you can use each setting also depends on panel Hz and backlight Hz, so usually the higher end LCDs are better at this.
Your EX700 for example is an entry level UHD tv. It has a 50hz panel and has some motion enhancements, but not ones able to be used at their strongest. For that you'll need a tv with a 100hz panel and a faster hz backlight.
Now each manufacturers implementation is different right? Each tv model is different too.
Some let you control independently how strong each setting is. Some only let you change preset without customisation. Some only support interpolation.
So with this in mind you want to try and find a model with the highest hz panel you can (100) with also settings that match your needs.
Sony tv's with 100hz panels generally get good motion reviews. Sadly most mid range/low range Sony's also use IPS panels. That means if you want a Sony on a budget you lose out with generally worse screen uniformity, greyer blacks and lower contrast. You can customise to have only frame insertion, but only up to a point. To fully reach those 1080 plasma like lines you need to use a bit of interpolation so vis-a-vis some soap opera effect. However most people say this isn't really that noticeable or is very slight.
Samsung LCDs tv's give you full customisation
Panasonic LCDs give full customisation
LG LCD tv's don't have much frame insertion, if at all. They rely on interpolation too much. You get custom control but you can't get 1080 lines with it. Even with their high end LCDs and interpolation they still only reach around 900 lines n
Hisense LCD tv's are similar to LG except you can only reach 600 lines, with interpolation.
Philips LCD tv's tend to be great with motion. They have customisation and can reach 1080 lines without interpolation.
But ultimately everyone's eyes are different and you may will be happy even with a 50hz tv. Sometimes there's judder present in a source no matter what tv. Sometimes there are faults in encoding on tv that can cause judder. Sometimes people complain about judder and it's natural in movies because they are shot at such low FPS.
Go demo some tv's yourself. Take your own content and see what you think. You may be happy with another tv without any motion settings on or you may prefer one kind of motion processing better than another.
Generally in reviews Samsung's implementation of frame insertion is rated best, followed by Panasonic and Philips. Sony's isn't the best as it causes more flickering than the others when using frame insertion. Hisense and LG are worst imo
So tltr if you don't want to fiddle with settings look at a second hand plasma for motion. If you want to find an LCD good with motion look at high end models. If you want good motion from a cheaper LCD it will likely mean you have to settle for a worse panel type.