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As you were suggesting in your comparison between the Pentax XF and some other eyepieces...there is a difference (sometimes small) but that last 5-10% improvement is where the cost is.
That is why I generally recommend to people who are starting out to use what they have or save for the good stuff. The "middle" gains little (some exceptions apply) but cost.
The more you use the Pentax (and similar) you will notice other subtle differences that enhance your viewing experience. Each individually criteria of the eyepeice may only be a small improvement over the standard but in total it will be (become) even more enjoyable to use...
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