I have a question regarding computer monitors.  I edit using Vegas Pro 12 however let me hasten to add I do it just for fun.  I guess you might call me a serious hobbyist.
So now I have two cams that deliver 4k video: a Sony AX100 and a Sony A7RII.  I have been informed that my Dell U2410 monitor is unable to do justice to 4k imagery.
Is this true?  Do I need a new 4k monitor possibly a 28" model?  If so suggestions most appreciated.
Many thanks
Cheers...