Thanks for your answer. Makes no sense does it, if you think about it. The Tizen OS watch is not compatible with Tizen phones...
I think I did read somewhere that it should be compatible with the Z3, or that compatibility was on the list for the Z3.
Anyhow I am a Tizen fanboy. I was already very let down when I got my NX1 to find out my Z1 was not compatible either with it.
I will get the Z3 next week, hoping it will not let me down with connecting to my NX1 and future Gear S2..