After playing a few games on Deity for the first time.I have decided Egypt is not as good in deity as it is in immortal or less,for the simple fact that even with egypts UA,marble(15% wonder production in ancient/classic eras) and the policy that gives +15% wonder production I still was only able to finish 1-2 wonders.(by the industrial era)
So to recap, I believe Egypt is godly if not the best civ in immortal or below.In deity I consider them mid to low tier.