Unlike most WFRP fans (or at least what most will tell you), I started in WFRP with 2E, and found the system to be an improvement on the ground work of 1E.
Zweihander is an improvement on WFRP2E, one way in which it is better is that you can set the tone a bit better as it classifies all careers into six classes of people: Academic, Commoner, Knave, Ranger, Socialite, Warrior. Want a game of dirty peasants walking the heroic journey cut out all but Commoner, Knave, and maybe Ranger. Want a grounded, dirty experience with no courtroom drama just eliminate Academic and Socialite. Want to go the other way and be all about politicing? Only play Academic and Socialite careers. Each of these classes only dictate some trappings (gear) and 12 professions (which are very similar to WFRP 1-2E) that you can start with. So while it can guide the tone of the game this isn't like limiting a D&D game to 2 or 3 or 4 classes.
The digital copy is fully indexed, has a great TOC, and both are hyperlinked to their pages to help ease the 700 pages of content.
700 pages is crazy huge! Except this is a One Book RPG, a full bestiary and example adventure pad out the content greatly. At it's core Zweihander remains a rather simple game with several great innovations on the WFRP core. I would consider it roughly as mechanically heavy as 5th edition D&D. The PHB section is about 350 pages (the list of professions is 120 pages, 80 more are spells), the DMG about 100, the bestiary about 160 pages, and the example adventure about 35 pages.
The artwork is crisp and fantastic and plentiful, and while I believe they could have made it color, and like No Country For Old Men, Logan, and Mad Max: Fury Road, its better in binary. If it wasn't an economic decision it should have been an artistic decision because it makes the art POP.
Anyway, I'm just saying it's worth the time to download the pdf and skim because if you're anything like me you'll fall in love with it.