Left to right, Scarpa Grand Dru, Crispi Nevada GTX, Meindl Alaskan Hunter, Lowa Tibet LL.

The Nevada defiently has less tread than the others and way more rocker in the toe as well as being much much more flexible. The Meindl has been resoled in this pic.

The Scarpa is a 42.5, Crispi a 41.5EE, Miendl 41.5EE and Lowa 41EE. The Crispi is the lightest less substantial boot, way less volume of boot than the Meindl or Scarpa and slightly more than the Lowa.

This view from the front shows how much smaller the Crispi is than the others the Scarpa even thought it isn’t a wide is on a much bigger last it’s has way more volume than the Wide Crispi or Meindl and far more than the Lowa

From the rear you can really see the size difference of the boots. I think the Nevada compares most to the lowa, the lowa is much stiffer and performs better in rugged terrain though

The number one biggest downfall to the Crispi is the price. I paid double for the Crispi as for either the Lowa or Scarpa and $100 more than the Meindl for what IMO is a lot less boot. Even though the Scarpa is a $500 boot and the Tibet is $400 there are so many distributors and the market is so huge for those manufactures you can constantly find discounted boots or barely used boots for a fraction of the cost. Scarpa, Meindl, Zamberlan, Lowa and La Sportiva are huge mountaineering boot companies that build very well built boots and have been for years.
Hopefully that was helpful to the OP as well. Not entirely on topic but all of those boots except the Crispi’s were purchased at not much more than $200. I’ve also had several other pairs of Lowa, Scarpa and Zamberlan boots I no longer own. I would much rather a slightly used high end boot than a new cheap one.