Check out this detailed graphics comparison between DiRT 4 versus DiRT Rally. Both games look great, each with it's own strength. Both games set to ULTRA settings.
My own analysis about both games graphics. Some say DiRT 4 looks downgraded compared to DiRT Rally. The thing is that DiRT 4 has a different art style. It's more focused on real life lighting and it's not as vibrant as DiRT Rally, which has increased color vibrance, contrast, the shadows are way darker, etc. The motion blur also
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