If you own V20’s and you are comfortable with their plastic shells, IMO you actually don’t need to buy v80’s. V20’s and V80’s sound pretty similar. With the same eartips and cable (not the crappy stock ones), v80’s have a little more bass and slightly brighter highs than V20’s.
V20’s and V80’s have potentials, don‘t be fooled by their stock eartips abs cables. V20’s are one of the most neutral IEMs under $100 and V80’s are slightly more colored. I actually prefer v20’s over any other sub-50 Chi-fi IEMs.