H&W guns are just so well finished - as probably the others are (Recknagel and Dumoulin etc).

As to the difference between a Magnum Mauser and a CZ Action,
to be honest if it's just a using gun, use whatever you want IMHO - they both achieve the same objective and I have seen some superb 500 Jeffrey's and 505 Gibb's built on CZ's (and M17's) and compared to my Magnum Mauser 505 Gibbs ??? It's nice to own but they all kill the same in the field.