The 85" 8K Samsung is 5 inches bigger than the 80" 8K Sharp TV But Cost only $15,000 compares to Sharp $17,800. That is like $2,800 cheaper and if both are the same size of 80", the Samsung might be even cheaper, as much as another $1,000 to $2,000 cheaper.
Don't forget the Samsung peak brightness is 4,000 nits compare to Sharp 1,000 nits. That is 4 times brighter and awesome for HDR. So Samsung does seems like a better deal in term of specs. maybe sharp 8k tv might have better color and black level or something and is aim at professional use like business and commercial use, that is why its more expensive...