Just to clarify, focus peaking is unrelated to focus magnification...it's a separate and different system to aid manual focusing.
Focus magnification is present on every camera with an electronic viewfinder that I've ever seen or heard of - I'd be surprised if it was not available on an EVF camera. This is the function you're asking about - the ability to 'zoom in' or magnify the view (not the actual focal length) when trying to manually focus, so that you can look at one small, tiny area of the scene and fine-tune the focus. Most EVF cameras have at least a simple form of this, whereby it will magnify the view in the center of the frame, often in at least 2 stages of magnification (such as 7x and 14x). Some of the more advanced versions will allow you to move around the EVF and zoom in on any specific point you choose...and using the 4-way arrow keys you can move the magnified area around the scene to where you want. Touch-screen versions of these cameras can also display this on the LCD and often allow you to magnify at the point you touch.
Focus peaking is a form of manual focus aid which uses colored fringing to highlight the contrast edges within the frame that are most in focus. Peaking is often used as a tool for 'fast focusing' as opposed to slow, detailed, fine-tune focusing - because it provides a clear visual aid as to where your focusing, you can dial it in quickly, on the fly, handheld, and shoot. Using magnified view to fine-tune focus for maximum accuracy will usually be for someone taking landscape, macro, etc with tripod and plenty of time to get the focus right. Most cameras that offer Focus Peaking can also do magnification WITH peaking, allowing you to blend the two functions together for even more versatility. Some peaking systems allow the peaking color to be changed, and allow you to change the intensity and strength of the peaking indications.
