I own both the A4 and the Pro 2.
In my opinion I like the sound and synthesis a lot more on the Pro 2, but this is just taste.
Despite the oscillators being digital I find them a lot warmer and they sound better over a longer range as opposed to the A4 Oscillators that are quite sterile and have to be tweaked a bit more depending on if you want to play it in the lower or higher registers.
The Slop parameter on the Pro 2 works really well on the digital oscillators for a more “vintage” sound.
The A4 on the other hand has got linear detuning which is really nice for a more consistent detuned sound.
I’ve never really bonded with the raw oscillator sounds on the A4, but I imagine that they are designed with effects in mind and for that they work well.
The sequencer is a bit easier to get started on but not as powerful as the A4, this is where the A4 really shine and if it only had MIDI out it would beat the Pro 2.
The parameter locking is really powerful on the A4.
I haven’t tried the AK so I have no experience with the joystick but it really looks nice and expressive.
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