Maxim and a Ninja 650 should ride pretty differently.
The Ninja has a stiffer frame, makes more power, has wider sticker tires (more effort to turn in, way more grip, and higher confidence factor), and will out brake the Maxim by a big factor (double disc up front, and better tires allowing more of that force to be used).
The maxim is better compared to other cruisers (though it is much more upright than most modern cruisers).
Performance wise both the Ninja and SV650 are pretty close to the 600 super sports of the late eighties (although with considerably more mid range and less top end power).
Indeed, they’d eat the lunch of many litre bikes from the late 70s early 80s in everything but outright acceleration.