It sort of depends on how you look at it. The way I see it, INFJ and ESTJ is a worse mix then with INFP's. While all four letters are different in the latter pairup, they have a better function mix. Simply because all four of their functions are the same in reverse order. So there is this intrinsic underlying similarity with thought process. They can learn to understand and "get" each other quite well once the develop. Where as with INFJ's and ESTJ's there is no common ground on functions, and the process lifestyle and attitude order is as far removed as possible. Because of that there is no similarity with thought processes, and it is very hard (no matter how well developed) for those two types to intrinscally "get" each other.
The pattern I see for this is when the attidude irrational and rational axis's are all different, but the lifestyle axis is the same, creates the most difference. Following this, this means INFP's would have the toughest time with ESTP as far as potential to understand each other goes.