Grainy-Noisy even at low iso

[mrsr3]

So I have been having an issue w/grain-noise when shooting at a higher ISO (other than say 100!) 

Today, I rented a camera/lens thinking well maybe it's my camera - but alas, I have the same issue with the rented one.

The camera is a Canon 5D IV - my go to lens is a Sigma Art 85 mm Prime.

I took my daughter out into the shade on purpose, different settings, different places, etc, all the same issue... grain/noise.  Unless I shoot at 100 iso... which we all know isn't possible.  I have studied, I've had a camera in my hand all my life, what am I doing wrong? Same with my husband, we are both stumped.  His 7d has less noise! what! am I doing! I'm sure when you tell me I'll have a "duh" moment.  The pictures aren't as bad when I export them as jpgs, but in LR RAW - they are horrible.  This camera should be spot on with noise even at extremely high iso.  I had to export it at 65% so I could import it here.

here are the settings for this picture, and it was taken in full shade.  The only "adjustments" I made were to make it smaller on export so I could upload it here.

iso250
85mm lens
f 7.1
1/200 sec

[ebiggs1]

"Maybe you could upload a 100%, small, cropped shot of the area."

The black area I u/l is at 200% and I see no grain.

[ebiggs1]

"...it was taken in full shade."

The best diffused light there is, love it.  I might have moved her over one way or the other to avoid the edge of the tree or to expose it more.  Critics are everywhere!