How can I skip leaves more beautifully?

As soon as I turn off the internal shader in Minecraft, the leaves on trees look pretty weird. I think this is due to the mip mapping, but if I change things it doesn't get any better. Does anyone have any idea why this could be? I've tried the settings for a while now, but haven't found the solution yet.

I don't think you can see it that well on the screenshot, but I couldn't make it sharper.

I think rather that you have already got used to the shader textures and that the standard textures are

In the graphics settings of Optifine, set the leaf details to "Intelligent".

These are the standard sheets…

This is standard. They are just tropical tree leaves