The first review is in a few days before the official release:
Samsung Galaxy S5 (Snapdragon 801) review | Android Authority
High five: Samsung's best phone gets better | Cnet
Samsung Galaxy S5 review: Fab Five - GSMArena.com
AnandTech | Samsung Galaxy S 5 Review
Samsung Galaxy S5 review - Pocket-lint
Samsung Galaxy S5 Review | Tech Radar
Samsung Galaxy S5 review | T3
Samsung Galaxy S5 review | trustedreviews.com
Samsung Galaxy S5 Review | phandroid.com
Samsung Galaxy S5 Review | stuff.tv
Samsung Galaxy S5 review | engadget.com
Samsung Galaxy S5 Review | The Verge
Samsung Galaxy S5 review - Wired UK
Samsung Galaxy S5 Review | androidcentral.com
Samsung Galaxy S5 Review | Droid Life
Samsung Galaxy S5 (Snapdragon 801) review | Android Authority
High five: Samsung's best phone gets better | Cnet
Samsung Galaxy S5 review: Fab Five - GSMArena.com
AnandTech | Samsung Galaxy S 5 Review
Samsung Galaxy S5 review - Pocket-lint
Samsung Galaxy S5 Review | Tech Radar
Samsung Galaxy S5 review | T3
Samsung Galaxy S5 review | trustedreviews.com
Samsung Galaxy S5 Review | phandroid.com
Samsung Galaxy S5 Review | stuff.tv
Samsung Galaxy S5 review | engadget.com
Samsung Galaxy S5 Review | The Verge
Samsung Galaxy S5 review - Wired UK
Samsung Galaxy S5 Review | androidcentral.com
Samsung Galaxy S5 Review | Droid Life