I don't know anything about the salaries at QATAR LAME (I am only SLF), but things to be aware if you move to Doha:-
1) Cost of living is similar or higher than the UK if you live a Western Expat life style.
2) There are concerns reported in the local media that inflation could be a problem in the next few years in the build up to the world cup in 2022.
3) If you have children of school age, I read that all the schools have long waiting lists for places.
However we are on our third posting here and had absolutely no problems deciding to come back here when offered Doha or Canada.