FZ 1000: bad focus/sharpness at tele end

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ajejebrazo1 Regular Member • Posts: 100
FZ 1000: bad focus/sharpness at tele end

My FZ 1000 seems to have problems in focusing at the tele end of the zoom, especially with Izoom enabled.  Images looks very soft and grainy. Some SOOC examples:

djokovic

goffin

pennetta

Some other images  taken under similar conditions looks much better, in line with FZ 1000 standards I'm used to, for example:

Any idea?
Thanks in advance. 
Ajeje

 ajejebrazo1's gear list:ajejebrazo1's gear list
Sony RX100 Canon PowerShot G15 Panasonic FZ1000
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