Auto Express put together an interesting comparison article that looks at the A-Class against the 1-Series and Golf.
It's a pretty in-depth comparison, in the end they ranked the 1-Series first, the Golf second, and the A-Class third.
Here's what they wrote:
The A-Class’ interior gives it true wow factor, because once you get inside, it’s the most impressive car in its class for combining quality and tech. The infotainment and materials make it really stand out. However, the Mercedes is let down by its slightly harsh ride, especially at lower speed. And even though it was the fastest model here, it doesn’t have the driver appeal to beat the Golf or 1 Series.