Your first mistake was going with a 13" laptop and 4K. I'd never have done that. I DO, however, have a 15.6" Dell with touch 4K and, as a commercial photographer, when combined with AdobeRGB, I'd never go back to FHD. Why, you may ask? No jaggies when enlarging a photo to 200, 300, or even 400%. Clients sometimes want to see the details on a garment or product I'm shooting, making sure they can see everything. 4K also offers finer gradation and movies in the hotel room after the shoot really pop. FHD screens are plain ugly beyond 100%. So, 4K is definitely worth it, but only if you choose a larger screen; 13" is barely beyond tablet territory.