Sorry for jumping in, got delayed.
Those 4 QBs compared to Goff, 2nd seasons (except for Rodgers, where 4th season was used)
Brady, age 24
86.5 rating
189.5 ypg, 18 td, 12 int, 6.9 ypa
Roethlisberger, age 24
98.6 rating
198.8 ypg, 17 td, 9 int, 8.9 ypa
Rodgers, age 25 (season 4)
93.8 rating
252.4 ypg, 28 td, 13 int, 7.5 ypa
Brees, age 23
76.9 rating
205.2 ypg, 17 td, 16 int, 6.2 ypa
Goff, age 23
101.5 rating
265 ypg, 16 td, 4 int, 8.5 ypa
It's too early to tell for sure, of course - but Goff's stats so far this season compare very well or outclass each of those 4. There have been rule changes, etc - but Goff is also the youngest (just turned 23) and overall his stats have been the best. There certainly is a chance that Goff will in the end be classed as good as any of those 4. Probably not the best of the 4 (though not impossible) but certainly could end up looking very good in that company.