on main codeshared routes ...And ex LHR of course is one of them..at least..EK and QF are going to coordinate pricing especially when it comes to published fares.There maybe slight discrepencies due to currency fluctuations, applications ofhttp://metro.co.uk/2017/12/29/guy-gets-penis-stuck-jumping-tube-station-barriers-7191042/amp/?ito=desktop.article.share.top.twitter&__twitter_i mpression=true taxes and the odd corporate deal or promotional discount code but when it comes to what the pax pays on point to point revenue ticket on published fare (which EK/QF stick to)the bottom line will be the same whether with EK or QF.
other airlines who have codeshare flights may have different agreements for different routes,