As for Lee and New 52 Superman, actually as time wears on even he had dialed back the lines and the armoredness of his design from even JL#1.
I always thought Jesus Merino did a pretty ok rendition of the Nu suit, especially when you contrast it with some of the other artists initially at the start of the New 52. For instance, George Perez's covers for his run, especially issue #1,made Superman look like an toy action figure!!! That image of Merino's actually evokes a more of a tight Leather-ish suit rather than armor (the iron man-esque boots aside). Look at the waist and the end of the cuffs. It looked thick and durable like leather or even rubber, but not plate armor by any means.
Now Gene Ha's rendition in that one issue of JL? THAT was plate armor.
To get back on topic, I'd safely say Swan is the all time greatest Superman artist, due to the fact he molded the character into what a majority of the public sees in their head when you evoke the comic book version of Superman.
While his art wasn't aging well by the late 70's (I still maintain to this day they should have took him off the main books as the regular artist and put him on the licensing and special projects/annuals), he was always solid, and I've never seen any piece of Superman art by him that was truly bad or sub-par. While there were certainly more dynamic artists that evoked the same sensibilities of Swan's Superman (Jose Luis Garcia-Lopez, Tom Grummett, Kerry Gammil and Dan Jurgens all come to mind) no one else's Superman art has ingrained itself into our pop culture consciousness more than Swan's. Whether or not he's my personal favorite Superman artist is irrelevant. He is the most influential Superman artist in the character's history aside from Shuster.