Hi confusedJW, something to consider about it being "soft" when you zoomed in. If you are at 300mm on that camera, you are at the equivalent of about a 450mm lens on a full frame 35mm camera.
At long lens lengths, every possible vibration is magnified onto your image. So, you may want to test it using a tripod and with delayed shutter release (so your finger doesn't induce shake).
Otherwise, the rule of thumb for hand-holding your camera is 1X(the focal length)(and remember, on your camera, the focal length is 1.5X what it would be on a 35mm), so to be assured of true sharpness hand-held at 300mm, you'd need to be shooting at close to 450/second.
Of course, you may be saying that it is "soft" when you "zoomed in" to the picture (more technically: cropped tightly, viewing the image), at all focal lengths? In which case, it could just be a not so great lens. However, be aware that digital images, raw off of the camera, almost always need sharpening, even on very expensive systems (in fact, it's worse on expensive cameras, because they leave camera sharpening turned off so that you have a more "raw", unprocessed image). You may not notice this however, until you are doing something like "zooming in" (tightly cropping) and looking for sharpness.
Good shooting, and I'll be back for another installment of camera geek next week.