More advanced monitors are recommended if you're serious about editing. However, if you're wondering whether 4K is worth the money, the answer is unequivocally no.
The use of a 4K monitor does not boost editing productivity. Unless you're trying for that next level video that requires a bit of realism, buying one makes little sense. On the other side, you want to create content that incorporates effects such as chroma-keying or film grain.
Speaking of which, keep in mind that many video editors require high-quality displays.