Thanks for your reply. I've been wearing my Solargraph for the last month and alternating in my various originals at the same time for comparison.
I basically agree with how you feel. Overall, I love the F1 Solargraph, I think TAG's designers did a great job of balancing the look of the old while freshening up the look for today. Plus, it's so comfortable to wear. I think it's mainly because of its rubber strap.
However, I found that the black strap on my newest addition, blue F1 381.513, is almost as soft and comfortable. I found this quite surprising, because the rest of my vintage straps feel stiffer and less comfortable in comparison. I believe when the original was first released, it had a thicker strap, closer to the thickness of the Solargraph. But later it seems a thinner strap was introduced, which to me feels less comfortable.
Here's a comparison. Bottom (L): replacement original strap (1.7mm thick). Middle: Original thicker strap from my first year ('86-'87) yellow/gray (2.4mm thick). Top (R): New Solargraph strap (2.7mm thick).
I'm not sure if my original gray, which yellowed with age, also got stiffer with age. But the black strap on my blue/black feels softer than either of my gray straps, or any of my other vintage F1 straps. (My black strap is also the thicker 2.4mm version, so I assume it's original to the watch.)
The one part of the Solargraph that I still have mixed feelings about is the case shape where it meets the strap. While the downward contour creates better wearability, I think the charm of the original case shape is lost. I also think the proportions of the original dial/bezel were lost in the translation to the 38mm size. The Solargraph's dial seems proportionately bigger, which is why I think it wears larger than a 38mm to me.