Just stayed there 2wks ago on a customer's corp rate and was upgraded to exec floor (am gold) and found that the main diff between rooms on exec and non (my colleagues were in non-exec) was that bathrooms have separate shower/tub. Not sure if it matters to you but it does to me.
Got in too late to see how lounge was, so sorry no advise there.
Do make sure you get lounge access. My colleagues breakfast was A$30 which to me was unreal
My only gripe was no free internet access there.
As others have said, very well located. Chinatown just round the corner too.