I found 6 rolls of Portra 800 120 on my last film inventory. Last Friday, I loaded one of the rolls into my Pentax 645.
After getting home, I opened the camera and found a roll of Portra 400. Someone had made a mistake. There were not many suspects. I do not mind making mistakes. It reminds me to be humble and helps me forgive others who make mistakes. The loss was how the images might have turned out if I had shot the correct film. I looked at the development chart and noted I would need to increase the development time by 1.3X.
As my last post was, these images were created at the Chehalis-Centralia Railroad and Museum (https://steamtrainride.com).
This is the Diesel-Electric Locomotive in use until the Steam Locomotive is repaired.
The negatives were scanned with the Epson V850, using VueScan software.
Steven Lawrence Pictures 
It’s pretty common practice by many people to shoot Portra 400 at EI 800, so I don’t think you were ever at risk of having any real issues with the photos. Even without the extended developing time, you likely would have been okay, only losing a bit of detail in the shadows. Portra 400 is extremely flexible. That said, while it’s less flexible, I like the aesthetic of Portra 800 a lot more. It’s got a more traditional-looking grain structure that’s far more attractive to my eye.
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I agree, I like the look of Portra 800.
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