Pretty damn nice looking. Can't say I see a reason to have 4k though (yet), displays for that will be uncommon and expensive, plus it'll munch away the storage super fast
http://www.trustedreviews.com/news/128gb-phone-tech-is-coming-says-sandisk Checked and there's not as of yet, assuming they were meaning by the time the phone releases (and likely at retail of £100+)