I have been Gold last year and I got upgraded 4 times:
Air France (ticket bought from Air France) - Business (intra Europe)
Delta (ticket bought from Air France) - First (short 1 hour domestic trip)
Delta (ticket bought from KLM) - Comfort + (TATL flight)
Delta (ticket bought from Delta) - Comfort + (domestic transcon)
If I take into consideration that my last TATL KLM flight had seats with recline broken that they could not sell and I got a row of 3 seats for myself I can count that as a 5th upgrade
Alas, I am Gold no more.