Etihad Guest is delighted to offer you a great opportunity to upgrade your tier status to Etihad Guest Gold and enjoy great benefits that come with it for free! Just show us your gold frequent flyer card (or any tier higher than gold) with another airline and we will upgrade your current Etihad Guest status to Etihad Guest Gold* - provided you are one of the first 1000 members to apply!
http://resources.etihadairways.com/e...web_04_12.html

With Emirates it seems if you E-Mail Skywards they will consider matching your Qatar Airways gold status to gold Skywards has well.