Sasuke is using the average size Perfect susanoo just stronger

[Unorthodox]

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look at the size of that rock under naruto's bijuudama the futhers one down now look what sasuke's ps jumped off of you see can see the wings a lil bit that speckle of blurrishness is perfect susanoo look how small it is

 

[Punk Hazard]

No .

 

[Its sasukebase]

now compare those rocks to the god tree there about the same size ps is around the size of the god tree those rock are probably mountain size

 

[ANiMUS]

You should use *********** scans they r clearer, but yeah the attacks are larger than Madara's I don't know about the size, but it is dodging between rocks so whatever

 

[Unorthodox]

No .

not to what can you see sasuke's ps its nothing compared to the eplosion of nardo's attack

 

[patrickscott]

Bro. The Perfect Stabilized Susanoo has only one size.

 

[AShinyPlatypus]

now compare those rocks to the god tree there about the same size ps is around the size of the god tree those rock are probably mountain size

Wut? The Shinju isn't around anymore, how can we compare them?

 

[Its sasukebase]

Wut? The Shinju isn't around anymore, how can we compare them?

in the bottom right the trunk is there

 

[Punk Hazard]

Wut? The Shinju isn't around anymore, how can we compare them?

The stump right there.

 

[blizard2]

no, its the size is a bit smaller than like mady, see shasuke in that diamond shape and scale that you will see how big it is

 

[AShinyPlatypus]

in the bottom right the trunk is there

Missed that first time round. Still, Sasuke's PS is still smaller than the rocks, so I'd have to agree with the OP that his Susanoo is about the same size as Madara's.

Spoiler

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Assuming that Sasuke and Madara's PS both have similar proportions, they should be fairly close to each other in size, based on the size of their bodies in the head of the PS.

 

[Tantalus Thief]

Sasuke already mastered his PS in a quick time.