This was the video that inspired me to buy all three of these cameras
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I like how the Pentax brand flies under the radar.
Of the three my favourite is the MX.
The KX has many fans and I love the build of this camera. The shutter sound is beautifully damped.
The big let down on the KX for me is the viewfinder - I find it dim and hard to focus, and the meter hard to read.
A perfect hybrid would be a KX body with the MX viewfinder and metering display.
The LX is a jewell, but is expensive to buy and service. For me it doesn’t inspire the same confidence as the mechanical KX and MX because of the ticking time bomb of the circuits (a problem shard by almost all 40 year old electronic cameras).