There Are Pandas, and Then There Are Pandas.
And this isn't either of them! The Pandas we're talking about here, are watches, not bears. And what got me thinking about them (again) was a link posted this morning by @cm.rook who pointed a few of us to the very attractive (and not terribly priced) Yema "Rallygraph" Panda which, in it's most traditional arrangement, looks like the one on the left, but can also be had in the version on the right: The model on the left is a true Panda, while the model on the right is called a reverse Panda. The reason for that distinction is clear--Panda bears, only come in the first arrangement. Now at this point, everyone should be thinking about the most well-know Panda, The Rolex Panda, which is actually a Daytona, and among Rolex Daytonas, the most famous of which is the Paul Newman Daytona, which was famous first, because it was Paul's, and second because it sold at auction for $17.8 million (US Dollars). The story of that auction is well-known so I'll only...
Nov 8, 2019
http://downloads.canon.com/nw/camera/products/lenses/sample/ef_50_14mtf.gif
vs
f1.8 https://shop.usa.canon.com/estore/images/ef-50mm-sample-2.gif
you can actually see the f1.8 holds up well in comparison but the f1.4 is almost equal to the f1.8 at max aperature, so at f1.8 to 2.8 big advantage as well as improved focus ring.