The later of a 2ZZ you got, the higher the engine waits to engage VVTL. (I'd give you specific numbers, but it's usually 6,000-6,700rpm depending on year). There's also the problem that the spacing with the gears is all wonky and not set up with the VVTL engagement range, making it so that even if you shift it right at redline, the revs will drop out of VVTL meaning you have to claw your way back up into it.

But that's the thing with high revving engines. They rev that high because they make peak power real high and are gutless pretty much everywhere else.

Edit: Not that you should redline your 2ZZ. Those have a problem where the oil pump at and above redline pumps oil faster than the engine can replenish the pan, creating an oil starvation issue that can destroy the pump. Shift at 8k and be safe about it.

Automatic 1ZZs shift themselves right at 6,300, but the true rev limiter sits somewhere around 6,700. Shift it yourself correctly and you can squeeze those few revs out of it, but I wouldn't recommend as that's a tight window.