Well if we want to be subjective I am almost 100% certain Sampras wins 0 Australian Opens if he is in the era of the 2 Australian Open GOATs- Djokovic and Federer. I highly doubt he does as well as Nadal who won it once and very nearly a couple other times and reached 4 finals in this super tough era for that event with Federer, Djokovic, Murray, Wawrinka, and others who excel there. Even in the 2 years Sampras won there he struggles with much lesser grinders, going deep into the 5th set numerous times. His only big win was the win over a declining Courier in the 94 semis. Both years Sampras won the Australian Open Agassi didnt play, he couldnt even beat him there. So yeah if you say put Nadal back then and he doesnt win Wimbledon, I say put Sampras today and he wins neither the French or Australian Open, and while he still wins Wimbledons he is nowhere near as dominant on the slowed down grass today just as Nadal suffers on the faster grass of old. Of course that is subjective, but facts favor Nadal too. Sampras is only superior to Nadal at the Australian Open on the extra title, not overall level of play IMO.
Courier played some good tennis in AO 94 semi, but Sampras was too good that day. Sampras' best performance on slow HC at the AO.
Courier was even better in AO 95 QF, but Sampras beat him in 5 sets.
The struggles of Sampras were before the SF. So not that relevant when talking about potential meeting in SF/F b/w these guys.
As far as Agassi is concerned, Sampras had 2 SPs to up 2 sets to one in 95 and was 2 points away from beating Agassi in 00 semi (closer than Nadal was in AO 12 or AO 17 final to winning the match)
Pretty sure that Sampras of 94/95/97/00 would have a good shot taking out Federer of AO 06/08 and more than decent shot in 09 final .
Obviously federer wins in 04/05/07 and even in AO 09 QF/SF form and 10 AO SF/F form as well.
I'd say he has more than a decent shot vs djoko in AO 12/13/14/15 ....
12 - Murray & Nadal came close.
13 - stan came close.
14 - he lost to stan in 5.
15 -- was mediocre in the SF vs stan. In the final, though very good, he was still beatable. Murray was up a break in the 3rd and lost his way from there on then triggered by djoko's shenanigans.
11 was djoko's best, so obviously Sampras loses.
16 - I am only including SF/F, so Sampras loses here as well.
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I'd say Sampras wins 1 AO.
Level wise, I'd put Sampras a tad ahead.