My experience is of course limited to the 4 sectors that I've done, but my observation is that the more senior crew members seem to be more service-oriented, friendlier, and more efficient that the juniors. This is quite different from, say, United, where the general rule is - the more senior, the crankier

Oh I forgot to mention, one perhaps undesirable thing that I witnessed is a male FA preparing the premium economy meal trays on the floor. Yikes!