lsblk -plo NAME,FSUSED,SIZE,FSUSE% /dev/sda4 
NAME      FSUSED   SIZE FSUSE%
/dev/sda4 777.4G 872.1G    91%

df -h /dev/sda4
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda4       858G  778G   37G  96% /media/EVO_860

what is going on here?
lsblk says sda4 is 91% full and df says 96% (96% is correct)
and df says 858 - 778 = 37 , which is obviously not true
also the sizes dont match, which is propably a result of the -h flag but they also dont match when i use -H