The Panasonic TX-48CXW404 has a maximum display resolution of 4K Ultra HD. That's over four times the display resolution of the most frequently found HD type of Full HD. 4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.
This TV's display resolution (4K Ultra HD) is in fact the best display resolution amongst all TVs of a similar type and age to the TX-48CXW404.
The worst display resolution across similar types of TV is HD Ready.
4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.
Alternative 4K Ultra HD televisions currently available which you might also want to consider include the 49UF7767, or the 43UF7707 both from LG which is cheaper.