If you have 50k in your bank account and want to buy a phone of it just go for samsung galaxy note 5 what makes it better than other is everthing starting from ram its the best 4 gb ram no phone has better ram than note 5 only 3 4 phoned have 4gb ram .
And note 5 is one of them display its the best display in the market yes there is sony z5 premium which has a 4k display but dont forget that only on ultra clear photos or videos phone screen is 4k normally if you open browser or anything else it will remain full hd display camera is also reviewed as the best camera it also have a feature called vdis which can stabilise videos while recording performance is also brilliant I didnt experienced any type of problem till now I am using note 5 for 3 months and still is as good as it was when I bought it go for it