Vacheron came with their WT some 5 years ago, Patek WT was born ( the modern, not the vintage ) in 2000, Tissot some 3 years ago, only Montblanc launched their Orbis Terrarum this year, but JLC had several WT during these last 10 years, always with an additional feature, Chronograph, Alarm or... This year, a Dead Second, which is, as far as I know, a first for a World Time.
And we have the pleasure to see a new movement, which is not the case for almost all the others...
Best,
Nicolas