Get a Free 3-6 Star Baron Zemo this Week!
Log in to the Summoner's Market at https://store.playcontestofchampions.com/ and claim the Baron Zemo Selector between 10am PT November 24 and 10am PT on December 1st.
Proven and Below: 3-Star
Conqueror/Uncollected: 4-Star
Cavalier/Thronebreaker: 5-Star
Paragon/Valiant: 6-Star
You can only claim this Baron Zemo one time. The Baron Zemo is delivered as a selector, claiming it will require you to choose your rarity immediately. If you plan to change your Progression level during the Cyber Week event, we suggest you wait until you have made that change before claiming this selector.
Log in to the Summoner's Market at https://store.playcontestofchampions.com/ and claim the Baron Zemo Selector between 10am PT November 24 and 10am PT on December 1st.
Proven and Below: 3-Star
Conqueror/Uncollected: 4-Star
Cavalier/Thronebreaker: 5-Star
Paragon/Valiant: 6-Star
You can only claim this Baron Zemo one time. The Baron Zemo is delivered as a selector, claiming it will require you to choose your rarity immediately. If you plan to change your Progression level during the Cyber Week event, we suggest you wait until you have made that change before claiming this selector.
6 star rank 3 stats increase

Why is it that from rank 1 to rank 2 the increase in attack and hp is 38% and from rank 2 to rank 3 the increase is only 19%?
For example corvus r1 has 23000 hp and then in rank 2 he has 32000, that is a 39% increase. But from rank 2 to rank 3 he gets to 38000 which would be a 19% increase, in other words half the increase than from r1 to r2.

5 star and 4 star always had a 36% increase from one rank to the next.
For example corvus r1 has 23000 hp and then in rank 2 he has 32000, that is a 39% increase. But from rank 2 to rank 3 he gets to 38000 which would be a 19% increase, in other words half the increase than from r1 to r2.

5 star and 4 star always had a 36% increase from one rank to the next.
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Comments
The jump from R2 to R3 is minimal compared to past level increases. That's far from a bad thing though as it means that 5* champs are relevant for things like story and war even longer. Anyone complaining that the jump wasn't enough is pretty short-sighted as far as I'm concerned
You said paying more for less doesn't make sense but you're not paying for less of anything. You're paying to get to whatever the next decided upon power level is. Nothing says the increase has to be linear. It's just whatever level was decided on.