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Sokyoku possesses the power to destroy the entire planet through insane thermal disruption.
The sole source of information for this come from a dubious source. Aizen tells this to Momo in a letter where he is manipulating her by inventing a fake plot to destroy Soul Society.
I've seen it noted before that Toshiro doesn't question the actual power of the Sokyoku to destroy Soul Society but rather questions if the plot itself to release it during Rukia's execution is true... but I would not take this as validation that the power of the Sokyoku is as described.
When the Sokyoku is actually released for Rukia's execution, several of the Vice Captains and Captains are surprised by it and clearly have not seen it be demonstrated before going by their reactions. They and Toshiro by extension don't seem like reliable accounts for the Sokyoku's capabilities. So Toshiro not questioning the Sokyoku being capable of destroying Soul Society isn't confirmation of Aizen's statement.
So the only statement we have of potential world-ending power from the Sokyoku is from a known liar in a letter where is lying to his subordinate - and he only really wanted to take advantage of the Sokyoku to destroy Rukia's body, not to wipe out Soul Society.
The spear can generate massive amounts of reiryoku that can overwhelm everything, giving further credence to the manga statement
This is a mild supporting statement sure but not especially useful given the seemingly hyperbolic nature of it. We also know that it can't in fact overwhelm everything.
Based on the information provided about the Sokyoku, it is able to destroy the entire Soul Society by means of a violent explosion. Tackling this with the simplest interpretation would imply that the halberd has planetary attack power.
While this may be the "simplest" way of looking at things, I don't think that necessarily means this is the most reliable or only way of looking at it.
It isn't stated that the Sokyoku would create an explosion, nor one big enough or strong enough to consume the entire planet in a single blast. The way the Sokyoku kills the condemned is seemingly by impaling them & burning them; not violently exploding them. "Insane thermal disruption" can refer just to the amount of heat it gives off.
Naturally Aizen doesn't elaborate on this supposed plot to "destroy the entire Soul Society" but a statement like that without further context doesn't mean we should assume the Sokyoku is meant to be used to blow up the entire planet in a single blast. For all we know this made-up villain from Aizen would use the Sokyoku to raze the Seireitei to the ground then raze the Rukongai to the ground over time, or unleash the power of the Sokyoku multiple times since it isn't stated that the Sokyoku can only be used once.
Consider the fact that a much weaker weapon than Sokyoku can destroy an entire Kyogoku, its connecting dimension, and deal large damage to Soul Society and the living world within a short time frame.
I can understand your logic with the Kido Cannon but there's no direct comparison between them. We have no idea what the true relation is between the "Million Zanpakuto" of the Sokyoku and these 200 Shinigami, or how the Kido Cannon uses the energy of these Shinigami.
I don't have much more to say on the Kido Cannon stuff because any meaningful comparison would be based on speculation.
Since this is the foundational root of a lot of the proposals here, and there's other potential issues in my mind like the "several dozen times" stronger statement, I'm not in favor of using this as the basis to say SAFWY Kenpachi is a solid Planet level.
Statements like "destroy the world" can have a lot of meanings besides a straightforward Planet level Attack Potency for a single attack/usage. In cases where it isn't known for certain, generally we tend to take the lower end approach.
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