Over the years there have been several HP/Agilent/Keysight sig gen/ sweep gen comparison/purchase guides, generally in the sales literature. I have also seen comparison guides between Fluke and HP/Agilent and Rhode & Schwartz RF sig gens and sweepers. I did a little searching for RF comparison guides and found the Keysight one as you noted. Most of the others I found were simplified catalogs for other companies like Rigol and Stanford Research. There are a couple of others like Global Spec and Engineering 360 that listed multiple companies products and a comparison. There was also a comparison guide for RF generators <$100. I did not find any of the HP/Agilent/Keysight comparison guides I have collected over the years. I believe I still have them, but they are in filing cabinets in one of my storage units. Some are lengthy- 40+ pages. When I find them I will talk to Dave @ Artek Media about scanning them and posting them either to this forum or on his site. Nothing I have is more current than 7 years ago, but probably goes back to the early 80¡¯s.
Best regards,
Don Bitters